The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
A bottom-up reconstruction of new physics atLarge Hadron Collider
Ritesh K. Singh
Institut fur Theoretische Physik und AstrophysikUniversitat Wurzburg
at
Tata Institute of Fundamental ResearchMumbai, January 13, 2010
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
1 The Standard ModelBuilding blockThe particles and forces
2 Beyond the Standard ModelThe approachNew physicsNew particles
3 New physics with top quarkTop quark at the edgeTop polarizationTop polarization measurement
4 Search for Extra-dimensionsFeatures of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
5 Conclusions
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
The Standard Model
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Sub-atomic world
It was long believed that matter is made of atoms and by mid 19thcentury it was an established fact.
By early 20th century we started to probe the Sub-atomic world.
Nucleus was identified in 1911.
Particle list:
1932: e, p, n were the fundamental building blocks.
1950: e, p, n, µ, νe , νµ, π±, π0,K 0,K± etc.
So many of particle cannot be fundamental.
+Certain pattern emerged among the zoo of particles.
⇒ These particle must be build of something else.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Sub-atomic world
It was long believed that matter is made of atoms and by mid 19thcentury it was an established fact.
By early 20th century we started to probe the Sub-atomic world.
Nucleus was identified in 1911.
Particle list:
1932: e, p, n were the fundamental building blocks.
1950: e, p, n, µ, νe , νµ, π±, π0,K 0,K± etc.
So many of particle cannot be fundamental.
+Certain pattern emerged among the zoo of particles.
⇒ These particle must be build of something else.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Sub-atomic world
It was long believed that matter is made of atoms and by mid 19thcentury it was an established fact.
By early 20th century we started to probe the Sub-atomic world.
Nucleus was identified in 1911.
Particle list:
1932: e, p, n were the fundamental building blocks.
1950: e, p, n, µ, νe , νµ, π±, π0,K 0,K± etc.
So many of particle cannot be fundamental.
+Certain pattern emerged among the zoo of particles.
⇒ These particle must be build of something else.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Sub-atomic world
It was long believed that matter is made of atoms and by mid 19thcentury it was an established fact.
By early 20th century we started to probe the Sub-atomic world.
Nucleus was identified in 1911.
Particle list:
1932: e, p, n were the fundamental building blocks.
1950: e, p, n, µ, νe , νµ, π±, π0,K 0,K± etc.
So many of particle cannot be fundamental.
+Certain pattern emerged among the zoo of particles.
⇒ These particle must be build of something else.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Sub-atomic world
It was long believed that matter is made of atoms and by mid 19thcentury it was an established fact.
By early 20th century we started to probe the Sub-atomic world.
Nucleus was identified in 1911.
Particle list:
1932: e, p, n were the fundamental building blocks.
1950: e, p, n, µ, νe , νµ, π±, π0,K 0,K± etc.
So many of particle cannot be fundamental.
+Certain pattern emerged among the zoo of particles.
⇒ These particle must be build of something else.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Sub-atomic world
It was long believed that matter is made of atoms and by mid 19thcentury it was an established fact.
By early 20th century we started to probe the Sub-atomic world.
Nucleus was identified in 1911.
Particle list:
1932: e, p, n were the fundamental building blocks.
1950: e, p, n, µ, νe , νµ, π±, π0,K 0,K± etc.
So many of particle cannot be fundamental.
+Certain pattern emerged among the zoo of particles.
⇒ These particle must be build of something else.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Sub-atomic world
It was long believed that matter is made of atoms and by mid 19thcentury it was an established fact.
By early 20th century we started to probe the Sub-atomic world.
Nucleus was identified in 1911.
Particle list:
1932: e, p, n were the fundamental building blocks.
1950: e, p, n, µ, νe , νµ, π±, π0,K 0,K± etc.
So many of particle cannot be fundamental.
+Certain pattern emerged among the zoo of particles.
⇒ These particle must be build of something else.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Sub-atomic world
It was long believed that matter is made of atoms and by mid 19thcentury it was an established fact.
By early 20th century we started to probe the Sub-atomic world.
Nucleus was identified in 1911.
Particle list:
1932: e, p, n were the fundamental building blocks.
1950: e, p, n, µ, νe , νµ, π±, π0,K 0,K± etc.
So many of particle cannot be fundamental.
+Certain pattern emerged among the zoo of particles.
⇒ These particle must be build of something else.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
The quark model
The matter particles were divide in two groups:
Hadrons: p, n, π±, π0,K± etc. particles that can interact strongly.
Leptons: e, νe , µ, νµ, τ , etc. particles that cannot interact strongly.
Leptons
are fundamental particles
interact only throughelectromagnetic and weakinteractions.
can be seen in free state.
justthe white space
Hadrons
are not fundamental particles
interact through strong weakand electromagneticinteractions.
are bound states of quarks thatcannot be seen in free state.
Quarks carry color quantum number and fractional electriccharges. (bottom-up)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
The quark model
The matter particles were divide in two groups:
Hadrons: p, n, π±, π0,K± etc. particles that can interact strongly.
Leptons: e, νe , µ, νµ, τ , etc. particles that cannot interact strongly.
Leptons
are fundamental particles
interact only throughelectromagnetic and weakinteractions.
can be seen in free state.
justthe white space
Hadrons
are not fundamental particles
interact through strong weakand electromagneticinteractions.
are bound states of quarks thatcannot be seen in free state.
Quarks carry color quantum number and fractional electriccharges. (bottom-up)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
The quark model
The matter particles were divide in two groups:
Hadrons: p, n, π±, π0,K± etc. particles that can interact strongly.
Leptons: e, νe , µ, νµ, τ , etc. particles that cannot interact strongly.
Leptons
are fundamental particles
interact only throughelectromagnetic and weakinteractions.
can be seen in free state.
justthe white space
Hadrons
are not fundamental particles
interact through strong weakand electromagneticinteractions.
are bound states of quarks thatcannot be seen in free state.
Quarks carry color quantum number and fractional electriccharges. (bottom-up)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
The quark model
The matter particles were divide in two groups:
Hadrons: p, n, π±, π0,K± etc. particles that can interact strongly.
Leptons: e, νe , µ, νµ, τ , etc. particles that cannot interact strongly.
Leptons
are fundamental particles
interact only throughelectromagnetic and weakinteractions.
can be seen in free state.
justthe white space
Hadrons
are not fundamental particles
interact through strong weakand electromagneticinteractions.
are bound states of quarks thatcannot be seen in free state.
Quarks carry color quantum number and fractional electriccharges. (bottom-up)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Stucture of the Standard Model
Gravity not included.
Gauge groups:SU(3)c × SU(2)L × U(1)Y
Additional particle: Higgs boson
SU(3)c singletSU(2)L doubletY = 1
Leads to masses of the particles viaspontaneous symmetry breaking.(top-down)
Describes almost all observed phenomenon
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Stucture of the Standard Model
Gravity not included.
Gauge groups:SU(3)c × SU(2)L × U(1)Y
Additional particle: Higgs boson
SU(3)c singletSU(2)L doubletY = 1
Leads to masses of the particles viaspontaneous symmetry breaking.(top-down)
Describes almost all observed phenomenon
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Stucture of the Standard Model
Gravity not included.
Gauge groups:SU(3)c × SU(2)L × U(1)Y
Additional particle: Higgs boson
SU(3)c singletSU(2)L doubletY = 1
Leads to masses of the particles viaspontaneous symmetry breaking.(top-down)
Describes almost all observed phenomenon
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Stucture of the Standard Model
Gravity not included.
Gauge groups:SU(3)c × SU(2)L × U(1)Y
Additional particle: Higgs boson
SU(3)c singletSU(2)L doubletY = 1
Leads to masses of the particles viaspontaneous symmetry breaking.(top-down)
Describes almost all observed phenomenon
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Building blockThe particles and forces
Stucture of the Standard Model
Gravity not included.
Gauge groups:SU(3)c × SU(2)L × U(1)Y
Additional particle: Higgs boson
SU(3)c singletSU(2)L doubletY = 1
Leads to masses of the particles viaspontaneous symmetry breaking.(top-down)
Describes almost all observed phenomenon
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
Beyond the Standard Model
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
Bottom-up vs Top-down
Top-down
Symmetry: gauge symmetry,space time symmetry etc.
Matter content: fermions,scalars and their quantumnumber under symmetries ⇒Lagrangian.
Self consistancy of Lagrangian:gauge anomaly etc.
Mechanisms: spontaneoussymmetry breaking, phasetransitions etc.
Predictions for experiments.
Bottom-up
Observables: σ, asymmetries,correlations etc.
Particle content: observed orrequired to explainobservations.
Quantum number: ad hocassignments to explainobservations.
Possible patterns in theparticles and their quantumnumbers ⇒ Symmetry.
Lagrangian
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
Bottom-up vs Top-down
Top-down
Symmetry: gauge symmetry,space time symmetry etc.
Matter content: fermions,scalars and their quantumnumber under symmetries ⇒Lagrangian.
Self consistancy of Lagrangian:gauge anomaly etc.
Mechanisms: spontaneoussymmetry breaking, phasetransitions etc.
Predictions for experiments.
Bottom-up
Observables: σ, asymmetries,correlations etc.
Particle content: observed orrequired to explainobservations.
Quantum number: ad hocassignments to explainobservations.
Possible patterns in theparticles and their quantumnumbers ⇒ Symmetry.
Lagrangian
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
Bottom-up vs Top-down
Top-down
Symmetry: gauge symmetry,space time symmetry etc.
Matter content: fermions,scalars and their quantumnumber under symmetries ⇒Lagrangian.
Self consistancy of Lagrangian:gauge anomaly etc.
Mechanisms: spontaneoussymmetry breaking, phasetransitions etc.
Predictions for experiments.
Bottom-up
Observables: σ, asymmetries,correlations etc.
Particle content: observed orrequired to explainobservations.
Quantum number: ad hocassignments to explainobservations.
Possible patterns in theparticles and their quantumnumbers ⇒ Symmetry.
Lagrangian
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
Bottom-up vs Top-down
Top-down
Symmetry: gauge symmetry,space time symmetry etc.
Matter content: fermions,scalars and their quantumnumber under symmetries ⇒Lagrangian.
Self consistancy of Lagrangian:gauge anomaly etc.
Mechanisms: spontaneoussymmetry breaking, phasetransitions etc.
Predictions for experiments.
Bottom-up
Observables: σ, asymmetries,correlations etc.
Particle content: observed orrequired to explainobservations.
Quantum number: ad hocassignments to explainobservations.
Possible patterns in theparticles and their quantumnumbers ⇒ Symmetry.
Lagrangian
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
Bottom-up vs Top-down
Top-down
Symmetry: gauge symmetry,space time symmetry etc.
Matter content: fermions,scalars and their quantumnumber under symmetries ⇒Lagrangian.
Self consistancy of Lagrangian:gauge anomaly etc.
Mechanisms: spontaneoussymmetry breaking, phasetransitions etc.
Predictions for experiments.
Bottom-up
Observables: σ, asymmetries,correlations etc.
Particle content: observed orrequired to explainobservations.
Quantum number: ad hocassignments to explainobservations.
Possible patterns in theparticles and their quantumnumbers ⇒ Symmetry.
Lagrangian
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
Bottom-up vs Top-down
Top-down
Symmetry: gauge symmetry,space time symmetry etc.
Matter content: fermions,scalars and their quantumnumber under symmetries ⇒Lagrangian.
Self consistancy of Lagrangian:gauge anomaly etc.
Mechanisms: spontaneoussymmetry breaking, phasetransitions etc.
Predictions for experiments.
Bottom-up
Observables: σ, asymmetries,correlations etc.
Particle content: observed orrequired to explainobservations.
Quantum number: ad hocassignments to explainobservations.
Possible patterns in theparticles and their quantumnumbers ⇒ Symmetry.
Lagrangian
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
Bottom-up vs Top-down
Top-down
Symmetry: gauge symmetry,space time symmetry etc.
Matter content: fermions,scalars and their quantumnumber under symmetries ⇒Lagrangian.
Self consistancy of Lagrangian:gauge anomaly etc.
Mechanisms: spontaneoussymmetry breaking, phasetransitions etc.
Predictions for experiments.
Bottom-up
Observables: σ, asymmetries,correlations etc.
Particle content: observed orrequired to explainobservations.
Quantum number: ad hocassignments to explainobservations.
Possible patterns in theparticles and their quantumnumbers ⇒ Symmetry.
Lagrangian
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
Bottom-up vs Top-down
Top-down
Symmetry: gauge symmetry,space time symmetry etc.
Matter content: fermions,scalars and their quantumnumber under symmetries ⇒Lagrangian.
Self consistancy of Lagrangian:gauge anomaly etc.
Mechanisms: spontaneoussymmetry breaking, phasetransitions etc.
Predictions for experiments.
Bottom-up
Observables: σ, asymmetries,correlations etc.
Particle content: observed orrequired to explainobservations.
Quantum number: ad hocassignments to explainobservations.
Possible patterns in theparticles and their quantumnumbers ⇒ Symmetry.
Lagrangian
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
Bottom-up vs Top-down
Top-down
Symmetry: gauge symmetry,space time symmetry etc.
Matter content: fermions,scalars and their quantumnumber under symmetries ⇒Lagrangian.
Self consistancy of Lagrangian:gauge anomaly etc.
Mechanisms: spontaneoussymmetry breaking, phasetransitions etc.
Predictions for experiments.
Bottom-up
Observables: σ, asymmetries,correlations etc.
Particle content: observed orrequired to explainobservations.
Quantum number: ad hocassignments to explainobservations.
Possible patterns in theparticles and their quantumnumbers ⇒ Symmetry.
Lagrangian
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
Bottom-up vs Top-down
Top-down
Symmetry: gauge symmetry,space time symmetry etc.
Matter content: fermions,scalars and their quantumnumber under symmetries ⇒Lagrangian.
Self consistancy of Lagrangian:gauge anomaly etc.
Mechanisms: spontaneoussymmetry breaking, phasetransitions etc.
Predictions for experiments.
Bottom-up
Observables: σ, asymmetries,correlations etc.
Particle content: observed orrequired to explainobservations.
Quantum number: ad hocassignments to explainobservations.
Possible patterns in theparticles and their quantumnumbers ⇒ Symmetry.
Lagrangian
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
Bottom-up vs Top-down
Top-down
Symmetry: gauge symmetry,space time symmetry etc.
Matter content: fermions,scalars and their quantumnumber under symmetries ⇒Lagrangian.
Self consistancy of Lagrangian:gauge anomaly etc.
Mechanisms: spontaneoussymmetry breaking, phasetransitions etc.
Predictions for experiments.
Bottom-up
Observables: σ, asymmetries,correlations etc.
Particle content: observed orrequired to explainobservations.
Quantum number: ad hocassignments to explainobservations.
Possible patterns in theparticles and their quantumnumbers ⇒ Symmetry.
Lagrangian
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
An example of top-quark
Top-down
Mass: Heavy
Charge: +2/3
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1
Spin : 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 etc.
Bottom-up
Mass: 173.1± 1.3 GeV
Charge: not +4/3 at 95% C.L.
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1 ???
Spin : possibly 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 (Br < 0.1)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
An example of top-quark
Top-down
Mass: Heavy
Charge: +2/3
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1
Spin : 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 etc.
Bottom-up
Mass: 173.1± 1.3 GeV
Charge: not +4/3 at 95% C.L.
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1 ???
Spin : possibly 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 (Br < 0.1)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
An example of top-quark
Top-down
Mass: Heavy
Charge: +2/3
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1
Spin : 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 etc.
Bottom-up
Mass: 173.1± 1.3 GeV
Charge: not +4/3 at 95% C.L.
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1 ???
Spin : possibly 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 (Br < 0.1)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
An example of top-quark
Top-down
Mass: Heavy
Charge: +2/3
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1
Spin : 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 etc.
Bottom-up
Mass: 173.1± 1.3 GeV
Charge: not +4/3 at 95% C.L.
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1 ???
Spin : possibly 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 (Br < 0.1)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
An example of top-quark
Top-down
Mass: Heavy
Charge: +2/3
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1
Spin : 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 etc.
Bottom-up
Mass: 173.1± 1.3 GeV
Charge: not +4/3 at 95% C.L.
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1 ???
Spin : possibly 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 (Br < 0.1)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
An example of top-quark
Top-down
Mass: Heavy
Charge: +2/3
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1
Spin : 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 etc.
Bottom-up
Mass: 173.1± 1.3 GeV
Charge: not +4/3 at 95% C.L.
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1 ???
Spin : possibly 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 (Br < 0.1)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
An example of top-quark
Top-down
Mass: Heavy
Charge: +2/3
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1
Spin : 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 etc.
Bottom-up
Mass: 173.1± 1.3 GeV
Charge: not +4/3 at 95% C.L.
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1 ???
Spin : possibly 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 (Br < 0.1)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
An example of top-quark
Top-down
Mass: Heavy
Charge: +2/3
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1
Spin : 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 etc.
Bottom-up
Mass: 173.1± 1.3 GeV
Charge: not +4/3 at 95% C.L.
Color Quantum number: 3
Iso-spin: +1/2
Hypercharge: +1 ???
Spin : possibly 1/2
Decay modes:t → b W +
t → b H+
t → c Z 0 (Br < 0.1)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
From Standard to New physics
The Standard Model has been tested to a high accuracy, but it still lacks
an experimental test of spontaneous symmetry breakingphenomenon or discovery of Higgs boson,
radiative stability of Higgs boson mass,
hierarchy of scales, electro-weak vs Planck scale,
first principle understanding of CP violation,
hierarchy of Yukawa couplings (fermion masses).
neutrino masses
dark matter candidate
Many solution to the theoretical issues are proposed:
SUSY
Scale hierarchy
Fermion massScale hierarchy
Extra Dim
CP violationFermion massScale hierarchy
Techni Color
CP violationFermion massScale hierarchy
Little Higgs
CP violationFermion massScale hierarchy
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
From Standard to New physics
The Standard Model has been tested to a high accuracy, but it still lacks
an experimental test of spontaneous symmetry breakingphenomenon or discovery of Higgs boson,
radiative stability of Higgs boson mass,
hierarchy of scales, electro-weak vs Planck scale,
first principle understanding of CP violation,
hierarchy of Yukawa couplings (fermion masses).
neutrino masses
dark matter candidate
Many solution to the theoretical issues are proposed:
SUSY
Scale hierarchy
Fermion massScale hierarchy
Extra Dim
CP violationFermion massScale hierarchy
Techni Color
CP violationFermion massScale hierarchy
Little Higgs
CP violationFermion massScale hierarchy
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
From Standard to New physics
The Standard Model has been tested to a high accuracy, but it still lacks
an experimental test of spontaneous symmetry breakingphenomenon or discovery of Higgs boson,
radiative stability of Higgs boson mass,
hierarchy of scales, electro-weak vs Planck scale,
first principle understanding of CP violation,
hierarchy of Yukawa couplings (fermion masses).
neutrino masses
dark matter candidate
Many solution to the theoretical issues are proposed:
SUSY
Scale hierarchy
Fermion massScale hierarchy
Extra Dim
CP violationFermion massScale hierarchy
Techni Color
CP violationFermion massScale hierarchy
Little Higgs
CP violationFermion massScale hierarchy
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
From Standard to New physics
The Standard Model has been tested to a high accuracy, but it still lacks
an experimental test of spontaneous symmetry breakingphenomenon or discovery of Higgs boson,
radiative stability of Higgs boson mass,
hierarchy of scales, electro-weak vs Planck scale,
first principle understanding of CP violation,
hierarchy of Yukawa couplings (fermion masses).
neutrino masses
dark matter candidate
Many solution to the theoretical issues are proposed:
SUSY
Scale hierarchy
Fermion massScale hierarchy
Extra Dim
CP violationFermion massScale hierarchy
Techni Color
CP violationFermion massScale hierarchy
Little Higgs
CP violationFermion massScale hierarchy
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
From Standard to New physics
The Standard Model has been tested to a high accuracy, but it still lacks
an experimental test of spontaneous symmetry breakingphenomenon or discovery of Higgs boson,
radiative stability of Higgs boson mass,
hierarchy of scales, electro-weak vs Planck scale,
first principle understanding of CP violation,
hierarchy of Yukawa couplings (fermion masses).
neutrino masses
dark matter candidate
Many solution to the theoretical issues are proposed:
SUSY
Scale hierarchy
Fermion massScale hierarchy
Extra Dim
CP violationFermion massScale hierarchy
Techni Color
CP violationFermion massScale hierarchy
Little Higgs
CP violationFermion massScale hierarchy
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
From Standard to New physics
The Standard Model has been tested to a high accuracy, but it still lacks
an experimental test of spontaneous symmetry breakingphenomenon or discovery of Higgs boson,
radiative stability of Higgs boson mass,
hierarchy of scales, electro-weak vs Planck scale,
first principle understanding of CP violation,
hierarchy of Yukawa couplings (fermion masses).
neutrino masses
dark matter candidate
Many solution to the theoretical issues are proposed:
SUSY
Scale hierarchy
Fermion massScale hierarchy
Extra Dim
CP violationFermion massScale hierarchy
Techni Color
CP violationFermion massScale hierarchy
Little Higgs
CP violationFermion massScale hierarchy
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
From Standard to New physics
The Standard Model has been tested to a high accuracy, but it still lacks
an experimental test of spontaneous symmetry breakingphenomenon or discovery of Higgs boson,
radiative stability of Higgs boson mass,
hierarchy of scales, electro-weak vs Planck scale,
first principle understanding of CP violation,
hierarchy of Yukawa couplings (fermion masses).
neutrino masses
dark matter candidate
Many solution to the theoretical issues are proposed:
SUSY
Scale hierarchy
Fermion massScale hierarchy
Extra Dim
CP violationFermion massScale hierarchy
Techni Color
CP violationFermion massScale hierarchy
Little Higgs
CP violationFermion massScale hierarchy
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
From Standard to New physics
The Standard Model has been tested to a high accuracy, but it still lacks
an experimental test of spontaneous symmetry breakingphenomenon or discovery of Higgs boson,
radiative stability of Higgs boson mass,
hierarchy of scales, electro-weak vs Planck scale,
first principle understanding of CP violation,
hierarchy of Yukawa couplings (fermion masses).
neutrino masses
dark matter candidate
Many solution to the theoretical issues are proposed:
SUSY
Scale hierarchy
Fermion massScale hierarchy
Extra Dim
CP violationFermion massScale hierarchy
Techni Color
CP violationFermion massScale hierarchy
Little Higgs
CP violationFermion massScale hierarchy
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
From Standard to New physics
The Standard Model has been tested to a high accuracy, but it still lacks
an experimental test of spontaneous symmetry breakingphenomenon or discovery of Higgs boson,
radiative stability of Higgs boson mass,
hierarchy of scales, electro-weak vs Planck scale,
first principle understanding of CP violation,
hierarchy of Yukawa couplings (fermion masses).
neutrino masses
dark matter candidate
Many solution to the theoretical issues are proposed:
SUSY
Scale hierarchy
Fermion massScale hierarchy
Extra Dim
CP violationFermion massScale hierarchy
Techni Color
CP violationFermion massScale hierarchy
Little Higgs
CP violationFermion massScale hierarchy
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
From Standard to New physics
The Standard Model has been tested to a high accuracy, but it still lacks
an experimental test of spontaneous symmetry breakingphenomenon or discovery of Higgs boson,
radiative stability of Higgs boson mass,
hierarchy of scales, electro-weak vs Planck scale,
first principle understanding of CP violation,
hierarchy of Yukawa couplings (fermion masses).
neutrino masses
dark matter candidate
Many solution to the theoretical issues are proposed:
SUSY
Scale hierarchy
Fermion massScale hierarchy
Extra Dim
CP violationFermion massScale hierarchy
Techni Color
CP violationFermion massScale hierarchy
Little Higgs
CP violationFermion massScale hierarchy
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
From Standard to New physics
The Standard Model has been tested to a high accuracy, but it still lacks
an experimental test of spontaneous symmetry breakingphenomenon or discovery of Higgs boson,
radiative stability of Higgs boson mass,
hierarchy of scales, electro-weak vs Planck scale,
first principle understanding of CP violation,
hierarchy of Yukawa couplings (fermion masses).
neutrino masses
dark matter candidate
Many solution to the theoretical issues are proposed:
SUSY
Scale hierarchy
Fermion massScale hierarchy
Extra Dim
CP violationFermion massScale hierarchy
Techni Color
CP violationFermion massScale hierarchy
Little Higgs
CP violationFermion massScale hierarchy
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
From Standard to New physics
The Standard Model has been tested to a high accuracy, but it still lacks
an experimental test of spontaneous symmetry breakingphenomenon or discovery of Higgs boson,
radiative stability of Higgs boson mass,
hierarchy of scales, electro-weak vs Planck scale,
first principle understanding of CP violation,
hierarchy of Yukawa couplings (fermion masses).
neutrino masses
dark matter candidate
Many solution to the theoretical issues are proposed:
SUSY
Scale hierarchy
Fermion massScale hierarchy
Extra Dim
CP violationFermion massScale hierarchy
Techni Color
CP violationFermion massScale hierarchy
Little Higgs
CP violationFermion massScale hierarchy
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
New particles
All new physics models introduce new symmetries and particles.
Scalars
Higgs, sfermions,techni-pions etc.
Productions :s-channel resonance,pair production,associated production
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Fermions
gaugino, higgsino,heavy fermion partners.
Productions :pair production,associated production.
s-channel resonance
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Vectors
KK-excitations of gaugebosons, heavy bosons.
Productions :s-channel resonance,pair production,associated production
Signature :polarization, 2-bodydecay, cascade decay.
s-channel resonance
Polarization observables and decay pattern are most importantfeatures to study new particles.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
New particles
All new physics models introduce new symmetries and particles.
Scalars
Higgs, sfermions,techni-pions etc.
Productions :s-channel resonance,pair production,associated production
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Fermions
gaugino, higgsino,heavy fermion partners.
Productions :pair production,associated production.
s-channel resonance
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Vectors
KK-excitations of gaugebosons, heavy bosons.
Productions :s-channel resonance,pair production,associated production
Signature :polarization, 2-bodydecay, cascade decay.
s-channel resonance
Polarization observables and decay pattern are most importantfeatures to study new particles.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
New particles
All new physics models introduce new symmetries and particles.
Scalars
Higgs, sfermions,techni-pions etc.
Productions :s-channel resonance,pair production,associated production
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Fermions
gaugino, higgsino,heavy fermion partners.
Productions :pair production,associated production.
s-channel resonance
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Vectors
KK-excitations of gaugebosons, heavy bosons.
Productions :s-channel resonance,pair production,associated production
Signature :polarization, 2-bodydecay, cascade decay.
s-channel resonance
Polarization observables and decay pattern are most importantfeatures to study new particles.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
New particles
All new physics models introduce new symmetries and particles.
Scalars
Higgs, sfermions,techni-pions etc.
Productions :s-channel resonance,pair production,associated production
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Fermions
gaugino, higgsino,heavy fermion partners.
Productions :pair production,associated production.
s-channel resonance
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Vectors
KK-excitations of gaugebosons, heavy bosons.
Productions :s-channel resonance,pair production,associated production
Signature :polarization, 2-bodydecay, cascade decay.
s-channel resonance
Polarization observables and decay pattern are most importantfeatures to study new particles.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
New particles
All new physics models introduce new symmetries and particles.
Scalars
Higgs, sfermions,techni-pions etc.
Productions :s-channel resonance,pair production,associated production
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Fermions
gaugino, higgsino,heavy fermion partners.
Productions :pair production,associated production.
s-channel resonance
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Vectors
KK-excitations of gaugebosons, heavy bosons.
Productions :s-channel resonance,pair production,associated production
Signature :polarization, 2-bodydecay, cascade decay.
s-channel resonance
Polarization observables and decay pattern are most importantfeatures to study new particles.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
New particles
All new physics models introduce new symmetries and particles.
Scalars
Higgs, sfermions,techni-pions etc.
Productions :s-channel resonance,pair production,associated production
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Fermions
gaugino, higgsino,heavy fermion partners.
Productions :pair production,associated production.
s-channel resonance
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Vectors
KK-excitations of gaugebosons, heavy bosons.
Productions :s-channel resonance,pair production,associated production
Signature :polarization, 2-bodydecay, cascade decay.
s-channel resonance
Polarization observables and decay pattern are most importantfeatures to study new particles.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
New particles
All new physics models introduce new symmetries and particles.
Scalars
Higgs, sfermions,techni-pions etc.
Productions :s-channel resonance,pair production,associated production
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Fermions
gaugino, higgsino,heavy fermion partners.
Productions :pair production,associated production.
s-channel resonance
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Vectors
KK-excitations of gaugebosons, heavy bosons.
Productions :s-channel resonance,pair production,associated production
Signature :polarization, 2-bodydecay, cascade decay.
s-channel resonance
Polarization observables and decay pattern are most importantfeatures to study new particles.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
New particles
All new physics models introduce new symmetries and particles.
Scalars
Higgs, sfermions,techni-pions etc.
Productions :s-channel resonance,pair production,associated production
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Fermions
gaugino, higgsino,heavy fermion partners.
Productions :pair production,associated production.
s-channel resonance
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Vectors
KK-excitations of gaugebosons, heavy bosons.
Productions :s-channel resonance,pair production,associated production
Signature :polarization, 2-bodydecay, cascade decay.
s-channel resonance
Polarization observables and decay pattern are most importantfeatures to study new particles.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
New particles
All new physics models introduce new symmetries and particles.
Scalars
Higgs, sfermions,techni-pions etc.
Productions :s-channel resonance,pair production,associated production
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Fermions
gaugino, higgsino,heavy fermion partners.
Productions :pair production,associated production.
s-channel resonance
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Vectors
KK-excitations of gaugebosons, heavy bosons.
Productions :s-channel resonance,pair production,associated production
Signature :polarization, 2-bodydecay, cascade decay.
s-channel resonance
Polarization observables and decay pattern are most importantfeatures to study new particles.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
New particles
All new physics models introduce new symmetries and particles.
Scalars
Higgs, sfermions,techni-pions etc.
Productions :s-channel resonance,pair production,associated production
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Fermions
gaugino, higgsino,heavy fermion partners.
Productions :pair production,associated production.
s-channel resonance
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Vectors
KK-excitations of gaugebosons, heavy bosons.
Productions :s-channel resonance,pair production,associated production
Signature :polarization, 2-bodydecay, cascade decay.
s-channel resonance
Polarization observables and decay pattern are most importantfeatures to study new particles.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
The approachNew physicsNew particles
New particles
All new physics models introduce new symmetries and particles.
Scalars
Higgs, sfermions,techni-pions etc.
Productions :s-channel resonance,pair production,associated production
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Fermions
gaugino, higgsino,heavy fermion partners.
Productions :pair production,associated production.
s-channel resonance
Signature :threshold behaviour,polarization, 2-bodydecay, cascade decay.
Vectors
KK-excitations of gaugebosons, heavy bosons.
Productions :s-channel resonance,pair production,associated production
Signature :polarization, 2-bodydecay, cascade decay.
s-channel resonance
Polarization observables and decay pattern are most importantfeatures to study new particles.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
New physics with top quark
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Top quark: A looking glass
The mass of the top-quark is very large (mt ∼ 173GeV)
top-mass being close to electro-weak scale, its couplings are sensitiveto EWSB. Any new physics of EWSB (or mass generation) affectstop-couplings with other particles.
its decay width (Γt ∼ 1.5 GeV) is much larger than the typical scaleof hadronization, i.e. it decays before getting hadronized. The spininformation of top-quark is translated to the decay distribution.
the decay lepton angular distribution is insensitive to the anomaloustbW couplings, and hence a pure probe of new physics intop-production process; observed for top-pair production at e+e−
(Rindani, Grzadkowski) as well as γγ collider (Ohkuma,Godbole).
leptons from top decay provide a clean and un-contaminatedprobe of top-production mechanism.
We have a clean looking glass for new physics.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Top quark: A looking glass
The mass of the top-quark is very large (mt ∼ 173GeV)
top-mass being close to electro-weak scale, its couplings are sensitiveto EWSB. Any new physics of EWSB (or mass generation) affectstop-couplings with other particles.
its decay width (Γt ∼ 1.5 GeV) is much larger than the typical scaleof hadronization, i.e. it decays before getting hadronized. The spininformation of top-quark is translated to the decay distribution.
the decay lepton angular distribution is insensitive to the anomaloustbW couplings, and hence a pure probe of new physics intop-production process; observed for top-pair production at e+e−
(Rindani, Grzadkowski) as well as γγ collider (Ohkuma,Godbole).
leptons from top decay provide a clean and un-contaminatedprobe of top-production mechanism.
We have a clean looking glass for new physics.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Top quark: A looking glass
The mass of the top-quark is very large (mt ∼ 173GeV)
top-mass being close to electro-weak scale, its couplings are sensitiveto EWSB. Any new physics of EWSB (or mass generation) affectstop-couplings with other particles.
its decay width (Γt ∼ 1.5 GeV) is much larger than the typical scaleof hadronization, i.e. it decays before getting hadronized. The spininformation of top-quark is translated to the decay distribution.
the decay lepton angular distribution is insensitive to the anomaloustbW couplings, and hence a pure probe of new physics intop-production process; observed for top-pair production at e+e−
(Rindani, Grzadkowski) as well as γγ collider (Ohkuma,Godbole).
leptons from top decay provide a clean and un-contaminatedprobe of top-production mechanism.
We have a clean looking glass for new physics.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Top quark: A looking glass
The mass of the top-quark is very large (mt ∼ 173GeV)
top-mass being close to electro-weak scale, its couplings are sensitiveto EWSB. Any new physics of EWSB (or mass generation) affectstop-couplings with other particles.
its decay width (Γt ∼ 1.5 GeV) is much larger than the typical scaleof hadronization, i.e. it decays before getting hadronized. The spininformation of top-quark is translated to the decay distribution.
the decay lepton angular distribution is insensitive to the anomaloustbW couplings, and hence a pure probe of new physics intop-production process; observed for top-pair production at e+e−
(Rindani, Grzadkowski) as well as γγ collider (Ohkuma,Godbole).
leptons from top decay provide a clean and un-contaminatedprobe of top-production mechanism.
We have a clean looking glass for new physics.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Top quark: A looking glass
The mass of the top-quark is very large (mt ∼ 173GeV)
top-mass being close to electro-weak scale, its couplings are sensitiveto EWSB. Any new physics of EWSB (or mass generation) affectstop-couplings with other particles.
its decay width (Γt ∼ 1.5 GeV) is much larger than the typical scaleof hadronization, i.e. it decays before getting hadronized. The spininformation of top-quark is translated to the decay distribution.
the decay lepton angular distribution is insensitive to the anomaloustbW couplings, and hence a pure probe of new physics intop-production process; observed for top-pair production at e+e−
(Rindani, Grzadkowski) as well as γγ collider (Ohkuma,Godbole).
leptons from top decay provide a clean and un-contaminatedprobe of top-production mechanism.
We have a clean looking glass for new physics.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Top quark: A looking glass
The mass of the top-quark is very large (mt ∼ 173GeV)
top-mass being close to electro-weak scale, its couplings are sensitiveto EWSB. Any new physics of EWSB (or mass generation) affectstop-couplings with other particles.
its decay width (Γt ∼ 1.5 GeV) is much larger than the typical scaleof hadronization, i.e. it decays before getting hadronized. The spininformation of top-quark is translated to the decay distribution.
the decay lepton angular distribution is insensitive to the anomaloustbW couplings, and hence a pure probe of new physics intop-production process; observed for top-pair production at e+e−
(Rindani, Grzadkowski) as well as γγ collider (Ohkuma,Godbole).
leptons from top decay provide a clean and un-contaminatedprobe of top-production mechanism.
We have a clean looking glass for new physics.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Anomalous top decay JHEP 0612, 021 (2006), [hep-ph/0605100]
Anomalous tbW vertex :
Γµ =g√2
[γµ(f1LPL + f1RPR)− iσµν
mW(pt − pb)ν (f2LPL + f2RPR)
]
In the SM, f1L = 1, f1R = 0, f2L = 0, f2R = 0.
Contribution from f1R , f2L are proportional to mb.
1
Γt
dΓt
d cos θf=
1
2
(1 + αf Pt cos θf
)αl = 1−O(f 2
i )
αb = −[m2
t − 2m2W
m2t + 2m2
W
]+ <(f2R)
[8mtmW (m2
t −m2W )
(m2t + 2m2
W )2
]+O
(mb
mW, f 2
i
)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Anomalous top decay JHEP 0612, 021 (2006), [hep-ph/0605100]
Anomalous tbW vertex :
Γµ =g√2
[γµ(f1LPL + f1RPR)− iσµν
mW(pt − pb)ν (f2LPL + f2RPR)
]
In the SM, f1L = 1, f1R = 0, f2L = 0, f2R = 0.
Contribution from f1R , f2L are proportional to mb.
1
Γt
dΓt
d cos θf=
1
2
(1 + αf Pt cos θf
)αl = 1−O(f 2
i )
αb = −[m2
t − 2m2W
m2t + 2m2
W
]+ <(f2R)
[8mtmW (m2
t −m2W )
(m2t + 2m2
W )2
]+O
(mb
mW, f 2
i
)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Anomalous top decay JHEP 0612, 021 (2006), [hep-ph/0605100]
Anomalous tbW vertex :
Γµ =g√2
[γµ(f1LPL + f1RPR)− iσµν
mW(pt − pb)ν (f2LPL + f2RPR)
]
In the SM, f1L = 1, f1R = 0, f2L = 0, f2R = 0.
Contribution from f1R , f2L are proportional to mb.
1
Γt
dΓt
d cos θf=
1
2
(1 + αf Pt cos θf
)αl = 1−O(f 2
i )
αb = −[m2
t − 2m2W
m2t + 2m2
W
]+ <(f2R)
[8mtmW (m2
t −m2W )
(m2t + 2m2
W )2
]+O
(mb
mW, f 2
i
)
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Lepton distribution JHEP 0612, 021 (2006), [hep-ph/0605100]
AB t P1 ... Pn−1
b W+
l+ ν
Lepton distribution is independent of anomalous tbW coupling if
t-quark is on-shell; narrow-width approximation for t-quark,
anomalous couplings f1R , f2R and f2L are small,
narrow-width approximation for W -boson,
b-quark is mass-less,
t → bW (`ν`) is the only decay channel for t-quark.
⇒ Lepton distribution from top decay is pure probe of possiblenew physics in the top production process.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Lepton distribution JHEP 0612, 021 (2006), [hep-ph/0605100]
AB t P1 ... Pn−1
b W+
l+ ν
Lepton distribution is independent of anomalous tbW coupling if
t-quark is on-shell; narrow-width approximation for t-quark,
anomalous couplings f1R , f2R and f2L are small,
narrow-width approximation for W -boson,
b-quark is mass-less,
t → bW (`ν`) is the only decay channel for t-quark.
⇒ Lepton distribution from top decay is pure probe of possiblenew physics in the top production process.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Lepton distribution JHEP 0612, 021 (2006), [hep-ph/0605100]
AB t P1 ... Pn−1
b W+
l+ ν
Lepton distribution is independent of anomalous tbW coupling if
t-quark is on-shell; narrow-width approximation for t-quark,
anomalous couplings f1R , f2R and f2L are small,
narrow-width approximation for W -boson,
b-quark is mass-less,
t → bW (`ν`) is the only decay channel for t-quark.
⇒ Lepton distribution from top decay is pure probe of possiblenew physics in the top production process.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Lepton distribution JHEP 0612, 021 (2006), [hep-ph/0605100]
AB t P1 ... Pn−1
b W+
l+ ν
Lepton distribution is independent of anomalous tbW coupling if
t-quark is on-shell; narrow-width approximation for t-quark,
anomalous couplings f1R , f2R and f2L are small,
narrow-width approximation for W -boson,
b-quark is mass-less,
t → bW (`ν`) is the only decay channel for t-quark.
⇒ Lepton distribution from top decay is pure probe of possiblenew physics in the top production process.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Lepton distribution JHEP 0612, 021 (2006), [hep-ph/0605100]
AB t P1 ... Pn−1
b W+
l+ ν
Lepton distribution is independent of anomalous tbW coupling if
t-quark is on-shell; narrow-width approximation for t-quark,
anomalous couplings f1R , f2R and f2L are small,
narrow-width approximation for W -boson,
b-quark is mass-less,
t → bW (`ν`) is the only decay channel for t-quark.
⇒ Lepton distribution from top decay is pure probe of possiblenew physics in the top production process.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Lepton distribution JHEP 0612, 021 (2006), [hep-ph/0605100]
AB t P1 ... Pn−1
b W+
l+ ν
Lepton distribution is independent of anomalous tbW coupling if
t-quark is on-shell; narrow-width approximation for t-quark,
anomalous couplings f1R , f2R and f2L are small,
narrow-width approximation for W -boson,
b-quark is mass-less,
t → bW (`ν`) is the only decay channel for t-quark.
⇒ Lepton distribution from top decay is pure probe of possiblenew physics in the top production process.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Lepton distribution JHEP 0612, 021 (2006), [hep-ph/0605100]
AB t P1 ... Pn−1
b W+
l+ ν
Lepton distribution is independent of anomalous tbW coupling if
t-quark is on-shell; narrow-width approximation for t-quark,
anomalous couplings f1R , f2R and f2L are small,
narrow-width approximation for W -boson,
b-quark is mass-less,
t → bW (`ν`) is the only decay channel for t-quark.
⇒ Lepton distribution from top decay is pure probe of possiblenew physics in the top production process.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Lepton distribution JHEP 0612, 021 (2006), [hep-ph/0605100]
AB t P1 ... Pn−1
b W+
l+ ν
Lepton distribution is independent of anomalous tbW coupling if
t-quark is on-shell; narrow-width approximation for t-quark,
anomalous couplings f1R , f2R and f2L are small,
narrow-width approximation for W -boson,
b-quark is mass-less,
t → bW (`ν`) is the only decay channel for t-quark.
⇒ Lepton distribution from top decay is pure probe of possiblenew physics in the top production process.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Polarization or t-quark: top-down JHEP 0612, 021 (2006), [hep-ph/0605100]
Polarized cross-sections
σ(λ, λ′) =
Z d3pt
2Et (2π)3
0@n−1Yi=1
d3pi
2Ei (2π)3
1A (2π)4
2Iδ
4
0@kA + kB − pt −
0@n−1Xi=1
pi
1A1A ρ(λ, λ′)
where ρ(λ, λ′) = M(λ, ...)M∗(λ′, ...)
Total cross-section: σtot = σ(+,+) + σ(−,−)
Polarization density matrix :
Pt =1
2
(1 + η3 η1 − iη2
η1 + iη2 1− η3
),
η3 = (σ(+,+)− σ(−,−)) /σtot
η1 = (σ(+,−) + σ(−,+)) /σtot
i η2 = (σ(+,−)− σ(−,+)) /σtot
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Polarization or t-quark: top-down JHEP 0612, 021 (2006), [hep-ph/0605100]
Polarized cross-sections
σ(λ, λ′) =
Z d3pt
2Et (2π)3
0@n−1Yi=1
d3pi
2Ei (2π)3
1A (2π)4
2Iδ
4
0@kA + kB − pt −
0@n−1Xi=1
pi
1A1A ρ(λ, λ′)
where ρ(λ, λ′) = M(λ, ...)M∗(λ′, ...)
Total cross-section: σtot = σ(+,+) + σ(−,−)
Polarization density matrix :
Pt =1
2
(1 + η3 η1 − iη2
η1 + iη2 1− η3
),
η3 = (σ(+,+)− σ(−,−)) /σtot
η1 = (σ(+,−) + σ(−,+)) /σtot
i η2 = (σ(+,−)− σ(−,+)) /σtot
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Polarization or t-quark: top-down JHEP 0612, 021 (2006), [hep-ph/0605100]
Polarized cross-sections
σ(λ, λ′) =
Z d3pt
2Et (2π)3
0@n−1Yi=1
d3pi
2Ei (2π)3
1A (2π)4
2Iδ
4
0@kA + kB − pt −
0@n−1Xi=1
pi
1A1A ρ(λ, λ′)
where ρ(λ, λ′) = M(λ, ...)M∗(λ′, ...)
Total cross-section: σtot = σ(+,+) + σ(−,−)
Polarization density matrix :
Pt =1
2
(1 + η3 η1 − iη2
η1 + iη2 1− η3
),
η3 = (σ(+,+)− σ(−,−)) /σtot
η1 = (σ(+,−) + σ(−,+)) /σtot
i η2 = (σ(+,−)− σ(−,+)) /σtot
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Polarization or t-quark: bottom-up JHEP 0612, 021 (2006), [hep-ph/0605100]
Polarization of t-quark through decay asymmetries:
αb = −0.4
αl = +1.0
αfη3
2=
σ(pf .s3 < 0)− σ(pf .s3 > 0)
σ(pf .s3 < 0) + σ(pf .s3 > 0)
αfη2
2=
σ(pf .s2 < 0)− σ(pf .s2 > 0)
σ(pf .s2 < 0) + σ(pf .s2 > 0)
αfη1
2=
σ(pf .s1 < 0)− σ(pf .s1 > 0)
σ(pf .s1 < 0) + σ(pf .s1 > 0)
si .sj = −δij pt .si = 0
For pµt = Et(1, βt sin θt , 0, βt cos θt), we have
sµ1 = (0,− cos θt , 0, sin θt), sµ2 = (0, 0, 1, 0), sµ3 = Et(βt , sin θt , 0, cos θt)/mt .
Ptlong is implemented in SHERPA.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Lepton’s azimuthal distribution JHEP 0612, 021 (2006), [hep-ph/0605100]
Lab frame azimuthal distribution of leptons:
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
0.04
0.045
0.05
0.055
0 1 2 3 4 5 6
(1/σ
) dσ
/dφ l
[ra
d-1]
φl [rad]
η3 = +0.83η3 = -0.83η3 = +0.73η3 = -0.48
A` =σ(cosφl > 0) − σ(cosφl < 0)
σ(cosφl > 0) + σ(cosφl < 0)
Used for:
Z′ at LHC (Les Houches 05)
g(1) in RS model at LHC(Nucl. Phys. B797, 1, (2008))
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Lepton’s azimuthal distribution JHEP 0612, 021 (2006), [hep-ph/0605100]
Lab frame azimuthal distribution of leptons:
0.93
0.94
0.95
0.96
0.97
0.98
0.99
1
2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4
Al(m
tt)
mtt [ x 103 GeV]
[ p p → t t ]
E1
SMSM + RS
A` =σ(cosφl > 0) − σ(cosφl < 0)
σ(cosφl > 0) + σ(cosφl < 0)
Used for:
Z′ at LHC (Les Houches 05)
g(1) in RS model at LHC(Nucl. Phys. B797, 1, (2008))
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Lepton’s azimuthal distribution JHEP 0612, 021 (2006), [hep-ph/0605100]
Lab frame azimuthal distribution of leptons:
0
0.5
1
1.5
2
2.5
3
3.5
4
0 π/2 π 3π/2 2π
2π/σ
dσ/
dφ
φ (rad)
Pp = ( 0.8,-0.6)η3 = +0.559, η1 = -0.504
lνb
Distribution of all the decayparticles.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Top polarization at LHC Boudjema, Porod and RS: Under progress
pp → tj → bl+νl j
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0 π/4 π/2 3π/4 π
(1/σ
) dσ
/dΦ
Φ
Leptonb-quark
0
2
4
6
8
10
12
14
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
(1/
σ) d
σ/dp
tT [
TeV
-1]
ptT [TeV]
∆lb =1
σ
∣∣∣∣ dσ
dφl− dσ
dφb
∣∣∣∣Depends upon:• Top polarization• pT
t distribution
σ = 131 pb η3 = −0.196∆lb = 0.35
Cuts: No cuts
Model: SM
Mg = 3TeV,Γg = 500 GeV Mg = 3TeV,Γg = 500 GeV
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Top polarization at LHC Boudjema, Porod and RS: Under progress
pp → t1¯t1 → tχ0
1tχ01
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 π/4 π/2 3π/4 π
(1/σ
) dσ
/dΦ
Φ
Leptonb-quark
0
1
2
3
4
5
6
7
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
(1/
σ) d
σ/dp
tT [
TeV
-1]
ptT [TeV]
∆lb =1
σ
∣∣∣∣ dσ
dφl− dσ
dφb
∣∣∣∣Depends upon:• Top polarization• pT
t distribution
σ = 1.44 fb η3 = +0.184∆lb = 0.12
Cuts: No cuts
Model: MSSMMt1
= 355 GeV, mχ = 164GeV Br(t1 → tχ0
1) = 0.76
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Top quark at the edgeTop polarizationTop polarization measurement
Top polarization at LHC Boudjema, Porod and RS: Under progress
pp → tt → bl+νl bl−νl
0
1
2
3
4
5
6
7
0 π/4 π/2 3π/4 π
(1/σ
) dσ
/dΦ
Φ
Leptonb-quark
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
(1/
σ) d
σ/dp
tT [
TeV
-1]
ptT [TeV]
∆lb =1
σ
∣∣∣∣ dσ
dφl− dσ
dφb
∣∣∣∣Depends upon:• Top polarization• pT
t distribution
σ = 3.36 pb η3 = +0.819∆lb = 0.40
Cuts: mtt ∈ [2.5, 3.5] TeV
Model: SM+g (1)
Mg = 3TeV, Γg = 500 GeV
Mg = 3TeV, Γg = 500 GeV
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Search for Extra-dimensions
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
World with extra-dimesions
In models with extra space dimensions, the additional dimensions arecompact.
Particle in a box
Compact extra dim
⇒ Infinite potential well
⇒
or Particle in a box
⇒ Infinite tower of
⇒
equi-spaced (R−1) states
Mass spectrum of photon:0, (R−1) GeV, 2(R−1) Gev, ...
Near-degenerate spectrum
All partilcles have infinite towerof states.
We have γ(1), Z (1), g (1), t(1)
etc. at nearly the same mass(R−1) Gev.
Several particles with same QNas in SM and large (R−1) butnear-degenerate mass.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
World with extra-dimesions
In models with extra space dimensions, the additional dimensions arecompact.
Particle in a box
Compact extra dim
⇒ Infinite potential well
⇒
or Particle in a box
⇒ Infinite tower of
⇒
equi-spaced (R−1) states
Mass spectrum of photon:0, (R−1) GeV, 2(R−1) Gev, ...
Near-degenerate spectrum
All partilcles have infinite towerof states.
We have γ(1), Z (1), g (1), t(1)
etc. at nearly the same mass(R−1) Gev.
Several particles with same QNas in SM and large (R−1) butnear-degenerate mass.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
World with extra-dimesions
In models with extra space dimensions, the additional dimensions arecompact.
Particle in a box
Compact extra dim
⇒ Infinite potential well
⇒
or Particle in a box
⇒ Infinite tower of
⇒
equi-spaced (R−1) states
Mass spectrum of photon:0, (R−1) GeV, 2(R−1) Gev, ...
Near-degenerate spectrum
All partilcles have infinite towerof states.
We have γ(1), Z (1), g (1), t(1)
etc. at nearly the same mass(R−1) Gev.
Several particles with same QNas in SM and large (R−1) butnear-degenerate mass.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
World with extra-dimesions
In models with extra space dimensions, the additional dimensions arecompact.
Particle in a box
Compact extra dim
⇒ Infinite potential well
⇒
or Particle in a box
⇒ Infinite tower of
⇒
equi-spaced (R−1) states
Mass spectrum of photon:0, (R−1) GeV, 2(R−1) Gev, ...
Near-degenerate spectrum
All partilcles have infinite towerof states.
We have γ(1), Z (1), g (1), t(1)
etc. at nearly the same mass(R−1) Gev.
Several particles with same QNas in SM and large (R−1) butnear-degenerate mass.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
World with extra-dimesions
In models with extra space dimensions, the additional dimensions arecompact.
Particle in a box
Compact extra dim
⇒ Infinite potential well
⇒
or Particle in a box
⇒ Infinite tower of
⇒
equi-spaced (R−1) states
Mass spectrum of photon:0, (R−1) GeV, 2(R−1) Gev, ...
Near-degenerate spectrum
All partilcles have infinite towerof states.
We have γ(1), Z (1), g (1), t(1)
etc. at nearly the same mass(R−1) Gev.
Several particles with same QNas in SM and large (R−1) butnear-degenerate mass.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
World with extra-dimesions
In models with extra space dimensions, the additional dimensions arecompact.
Particle in a box
Compact extra dim
⇒ Infinite potential well
⇒
or Particle in a box
⇒ Infinite tower of
⇒
equi-spaced (R−1) states
Mass spectrum of photon:0, (R−1) GeV, 2(R−1) Gev, ...
Near-degenerate spectrum
All partilcles have infinite towerof states.
We have γ(1), Z (1), g (1), t(1)
etc. at nearly the same mass(R−1) Gev.
Several particles with same QNas in SM and large (R−1) butnear-degenerate mass.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
World with extra-dimesions
In models with extra space dimensions, the additional dimensions arecompact.
Particle in a box
Compact extra dim
⇒ Infinite potential well
⇒
or Particle in a box
⇒ Infinite tower of
⇒
equi-spaced (R−1) states
Mass spectrum of photon:0, (R−1) GeV, 2(R−1) Gev, ...
Near-degenerate spectrum
All partilcles have infinite towerof states.
We have γ(1), Z (1), g (1), t(1)
etc. at nearly the same mass(R−1) Gev.
Several particles with same QNas in SM and large (R−1) butnear-degenerate mass.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
World with extra-dimesions
In models with extra space dimensions, the additional dimensions arecompact.
Particle in a box
Compact extra dim
⇒ Infinite potential well
⇒
or Particle in a box
⇒ Infinite tower of
⇒
equi-spaced (R−1) states
Mass spectrum of photon:0, (R−1) GeV, 2(R−1) Gev, ...
Near-degenerate spectrum
All partilcles have infinite towerof states.
We have γ(1), Z (1), g (1), t(1)
etc. at nearly the same mass(R−1) Gev.
Several particles with same QNas in SM and large (R−1) butnear-degenerate mass.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
World with extra-dimesions
In models with extra space dimensions, the additional dimensions arecompact.
Particle in a box
Compact extra dim
⇒ Infinite potential well
⇒
or Particle in a box
⇒ Infinite tower of
⇒
equi-spaced (R−1) states
Mass spectrum of photon:0, (R−1) GeV, 2(R−1) Gev, ...
Near-degenerate spectrum
All partilcles have infinite towerof states.
We have γ(1), Z (1), g (1), t(1)
etc. at nearly the same mass(R−1) Gev.
Several particles with same QNas in SM and large (R−1) butnear-degenerate mass.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Flat extra-dimensions and top quarks Under progress
In the models of flat extra-dimensions, there is a KK-tower of excitationscorresponding to each SM gauge bosons and fermions.
The channel under study at the LHC:
qq → V → tt
V ≡ γ, Z , g , γ(1), Z (1), g (1)
The pure SM background:
gg → tt
All KK-excitations contribute to a resonance in mtt distribution. Thepresence of Z and Z (1) is responsible for finite polarization of top quark.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Flat extra-dimensions and top quarks Under progress
In the models of flat extra-dimensions, there is a KK-tower of excitationscorresponding to each SM gauge bosons and fermions.
The channel under study at the LHC:
qq → V → tt
V ≡ γ, Z , g , γ(1), Z (1), g (1)
The pure SM background:
gg → tt
All KK-excitations contribute to a resonance in mtt distribution. Thepresence of Z and Z (1) is responsible for finite polarization of top quark.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Flat extra-dimensions and top quarks Under progress
In the models of flat extra-dimensions, there is a KK-tower of excitationscorresponding to each SM gauge bosons and fermions.
The channel under study at the LHC:
qq → V → tt
V ≡ γ, Z , g , γ(1), Z (1), g (1)
The pure SM background:
gg → tt
All KK-excitations contribute to a resonance in mtt distribution. Thepresence of Z and Z (1) is responsible for finite polarization of top quark.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Flat extra-dimensions and top quarks Under progress
In the models of flat extra-dimensions, there is a KK-tower of excitationscorresponding to each SM gauge bosons and fermions.
The channel under study at the LHC:
qq → V → tt
V ≡ γ, Z , g , γ(1), Z (1), g (1)
The pure SM background:
gg → tt
All KK-excitations contribute to a resonance in mtt distribution. Thepresence of Z and Z (1) is responsible for finite polarization of top quark.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Flat extra-dimensions and top quarks Under progress
In the models of flat extra-dimensions, there is a KK-tower of excitationscorresponding to each SM gauge bosons and fermions.
The channel under study at the LHC:
qq → V → tt
V ≡ γ, Z , g , γ(1), Z (1), g (1)
The pure SM background:
gg → tt
All KK-excitations contribute to a resonance in mtt distribution. Thepresence of Z and Z (1) is responsible for finite polarization of top quark.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Flat extra-dimensions and top quarks Under progress
10-3 10-2 10-1 1 10 102 103
0 500 1000 1500 2000 2500 3000 3500 4000
dσ/d
mtt
[fb/
GeV
]
mtt [GeV]
1.0 TeV1.5 TeV2.0 TeV2.5 TeV3.0 TeV
SM
-0.06
-0.05
-0.04
-0.03
-0.02
-0.01
0
0 500 1000 1500 2000 2500 3000 3500 4000
P t(m
tt)
mtt [GeV]
1.0 TeV1.5 TeV2.0 TeV2.5 TeV3.0 TeV
SM
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Flat extra-dimensions and top quarks Under progress
For MKK = 2 TeV, and |mtt −MKK | < 50 GeV,
Models σ(pp → tt) (fb) Pt
SM 77.9 −1.33× 10−3
SM + γ(1) 185 −2.55× 10−4
SM + Z (1) 150 −3.26× 10−1
SM + g (1) 1700 −6.13× 10−5
SM + VKK 1900 −5.78× 10−2
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Flat extra-dimensions and top quarks Under progress
Weak resonance model, fi fiV := AV T fi3 + BV Q fi ; i = L,R
-3
-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
-3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3
BV
AV
σW [fb]
220
220
210
200
200
180
160150
120100
-3
-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
-3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3
BV
AV
PWt
0.5
0.5
0.4
0.40.3
0.3
0.2
0.2
0.1
0.1
0
0 -0.1
-0.1
-0.2
-0.2
-0.3
-0.3
-0.4
-0.4
-0.5
-0.5
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Flat extra-dimensions and top quarks Under progress
Strong resonance model, f f V := RV PL + LV PL
-3
-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
-3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3
RV
LV
σS [pb]
0.2
0.4
0.6
0.8
1.2
1.4
1.6
-3
-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
-3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3
RV
LV
PSt
0.8
0.8
0.6
0.6
0.4
0.4
0.2
0.2
0
0
-0.2
-0.2
-0.4
-0.4
-0.6
-0.6
-0.8
-0.8
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Warped extra-dimension and top quark Under progress
In universal wrapped extra dimension model, with fermion localization inthe fifth dimensions, one has differing couplings of VKK .
For electro weak boson:
fi fiV :=(AV T fi
3 + BV Q fi)
QV (fi ) ; i = L,R
For strong boson:
f f V := QV (fR) RV PR + QV (fL) LV PL
can explain fermion mass hierarchy,
can explain AbFB anomaly thourgh Z − Z
′(1) mixing,
can explain AtFB anomaly thourgh g (1) contribution at Tevatron,
can be probed at LHC upto MKK = 3 TeV through polarization.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Warped extra-dimension and top quark Under progress
In universal wrapped extra dimension model, with fermion localization inthe fifth dimensions, one has differing couplings of VKK .
For electro weak boson:
fi fiV :=(AV T fi
3 + BV Q fi)
QV (fi ) ; i = L,R
For strong boson:
f f V := QV (fR) RV PR + QV (fL) LV PL
can explain fermion mass hierarchy,
can explain AbFB anomaly thourgh Z − Z
′(1) mixing,
can explain AtFB anomaly thourgh g (1) contribution at Tevatron,
can be probed at LHC upto MKK = 3 TeV through polarization.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Warped extra-dimension and top quark Under progress
In universal wrapped extra dimension model, with fermion localization inthe fifth dimensions, one has differing couplings of VKK .
For electro weak boson:
fi fiV :=(AV T fi
3 + BV Q fi)
QV (fi ) ; i = L,R
For strong boson:
f f V := QV (fR) RV PR + QV (fL) LV PL
can explain fermion mass hierarchy,
can explain AbFB anomaly thourgh Z − Z
′(1) mixing,
can explain AtFB anomaly thourgh g (1) contribution at Tevatron,
can be probed at LHC upto MKK = 3 TeV through polarization.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Warped extra-dimension and top quark Under progress
In universal wrapped extra dimension model, with fermion localization inthe fifth dimensions, one has differing couplings of VKK .
For electro weak boson:
fi fiV :=(AV T fi
3 + BV Q fi)
QV (fi ) ; i = L,R
For strong boson:
f f V := QV (fR) RV PR + QV (fL) LV PL
can explain fermion mass hierarchy,
can explain AbFB anomaly thourgh Z − Z
′(1) mixing,
can explain AtFB anomaly thourgh g (1) contribution at Tevatron,
can be probed at LHC upto MKK = 3 TeV through polarization.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Warped extra-dimension and top quark Under progress
In universal wrapped extra dimension model, with fermion localization inthe fifth dimensions, one has differing couplings of VKK .
For electro weak boson:
fi fiV :=(AV T fi
3 + BV Q fi)
QV (fi ) ; i = L,R
For strong boson:
f f V := QV (fR) RV PR + QV (fL) LV PL
can explain fermion mass hierarchy,
can explain AbFB anomaly thourgh Z − Z
′(1) mixing,
can explain AtFB anomaly thourgh g (1) contribution at Tevatron,
can be probed at LHC upto MKK = 3 TeV through polarization.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Warped extra-dimension and top quark Under progress
In universal wrapped extra dimension model, with fermion localization inthe fifth dimensions, one has differing couplings of VKK .
For electro weak boson:
fi fiV :=(AV T fi
3 + BV Q fi)
QV (fi ) ; i = L,R
For strong boson:
f f V := QV (fR) RV PR + QV (fL) LV PL
can explain fermion mass hierarchy,
can explain AbFB anomaly thourgh Z − Z
′(1) mixing,
can explain AtFB anomaly thourgh g (1) contribution at Tevatron,
can be probed at LHC upto MKK = 3 TeV through polarization.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Warped extra-dimension and top quark Under progress
In universal wrapped extra dimension model, with fermion localization inthe fifth dimensions, one has differing couplings of VKK .
For electro weak boson:
fi fiV :=(AV T fi
3 + BV Q fi)
QV (fi ) ; i = L,R
For strong boson:
f f V := QV (fR) RV PR + QV (fL) LV PL
can explain fermion mass hierarchy,
can explain AbFB anomaly thourgh Z − Z
′(1) mixing,
can explain AtFB anomaly thourgh g (1) contribution at Tevatron,
can be probed at LHC upto MKK = 3 TeV through polarization.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Warped extra-dimension and top quark Under progress
0.001
0.01
0.1
1
2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4
dσ/d
mtt
[fb/
GeV
]
mtt [ x 103 GeV]
[ p p → t t ]
E1
SMSM + RSSM + g(1)
SM + γ(1)
SM + Z(1)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4
P t(m
tt)
mtt [ x 103 GeV]
[ p p → t t ]
E1
SMSM + E1
Γg (1) = 627 GeV, ΓZ (1) = 75 GeV, Γγ(1) = 137 GeV(Nucl. Phys. B797, 1, (2008))
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Features of the extra-dimensionFlat extra-dimension at LHCWarped extra-dimension at LHC
Warped extra-dimension and top quark Under progress
In the case of warped extra-dimension:
there are too many free parameters for the fit.
the ”Weak resonance model” fails
the ”Strong resonance model” fits well with ”wrong” values of thecouplings.
more observables are needed to establish the presence ofextra-dimensions.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
to conclude ....
There are many models of physics beyond the SM.
These models are expected to have significant signals at upcomingLHC.
Many of the models will have similar collider signature.
We need a model-independent i.e. a bottom-up approach to thesignatures to establish or rule out some models.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
to conclude ....
There are many models of physics beyond the SM.
These models are expected to have significant signals at upcomingLHC.
Many of the models will have similar collider signature.
We need a model-independent i.e. a bottom-up approach to thesignatures to establish or rule out some models.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
to conclude ....
There are many models of physics beyond the SM.
These models are expected to have significant signals at upcomingLHC.
Many of the models will have similar collider signature.
We need a model-independent i.e. a bottom-up approach to thesignatures to establish or rule out some models.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
to conclude ....
There are many models of physics beyond the SM.
These models are expected to have significant signals at upcomingLHC.
Many of the models will have similar collider signature.
We need a model-independent i.e. a bottom-up approach to thesignatures to establish or rule out some models.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
to conclude ....
There are many models of physics beyond the SM.
These models are expected to have significant signals at upcomingLHC.
Many of the models will have similar collider signature.
We need a model-independent i.e. a bottom-up approach to thesignatures to establish or rule out some models.
Ritesh Singh New physics at LHC
The Standard ModelBeyond the Standard ModelNew physics with top quarkSearch for Extra-dimensions
Conclusions
Beyond the conclusions....
Spin measurement using azimuthal distribution (arXiv:0903.4705)
Spin assesment in off-shell decays: A case of gluino (Under progress)
Markov-Chain-Monte-Carlo analysis of MSSM-UG models(arXiv:0906.5048)
MCMC analysis of CPV-MSSM and GHU-MSSM (Under progress)
Ritesh Singh New physics at LHC