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Hunting for the Higgs at LHC
Konstantin GoulianosRU HOL FORUM October 6, 2011
The key to mass?
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Mg = 0 MW, Z~100 mp Mtop~Mgold
About the HiggsThe Standard Model (SM)
(Glashow, Salam and Weinberg – 1979 Nobel prize)
In the SM all particles have zero massThe Higgs field is needed to renormalize the theory “generates” mass – but not its own mass
Symmetry:
SU3XSU2XU1
H
WS
SM
udu
Mw and MZ
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Higgs mechanism
solves mass hierarchy problem
Higgs:renormalizes the theory (removes infinities) one neutral Higgs boson “generates” the quark masses
by coupling to quarks ~ mass.
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Mg = 0 MW, Z~100 mp
Mtop~Mgold
The SM & RU
Fermilab1995
CERN1970s
BNL 1962(my PhD thesisat Columbia)
BNL 1981
p pevidence for Z
Evidencefor quarks
Z discovered atCERN in 1983
predict charm in 1979 – Glashaw, Iliopoulos (RU) , Miani
H
What are we doing now in the search for the Higgs?
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-particlesSource
Rutherford Experiment
Large angle scattering atoms have nuclei
Particle accelerators
27 km tunnel 7 TeV4 mile (6.4 km) tunnel 2 TeV
1910
Fermilab Tevatron 1985 LHC 2010
CDFD0
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T. Virdee, ICHEP08 6
The Larhe Hadron ColliderLake GenevaLake GenevaLarge Large HadronHadron Collider Collider27 km circumference27 km circumference
Large Large HadronHadron Collider Collider27 km circumference27 km circumference
CMSCMS
ATLASATLAS
LHCbLHCb
ALICEALICE
CERNCERN
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Collisions at LHC
search down to 1 part in 1013
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H
H
Hbb (displaced vertex)
HW+W-
HZ0Z0 (Z0e+e- /)
ee
Higgs searches at CMS - I
HZZ
leplonleplon
let
let
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Higgs searches at CMS -II
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Super-symmetry (SUSY)
The SM is not stable at high energies because of loop corrections
SUSY renormalizes the SM by introducing opposite sign contributions
The lightest SUSY particle (LSP) escapes detection
candidate for dark matter
…but what about dark energy???
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Exclusive Higgs Production
H
POMERON
Phys. Rev. D 77, 052004
MeV21~δMTOF
δp2~M
10~M
m~/gg)qRate(q
Higgsidentifiesstate
oJ
72
2q
_
z
0
beam
p’
p’roman pots roman pots
dipole
dipole
beam
p+pp'+H+p'
H
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Higgs discovery limits
Tevatronrange
With 5fb-1 & combination of CMS+ATLAS data the SM Higgs exclusion reach is in the range140<MH<600GeVThe non-discovery of the SM Higgs will be an even bigger discovery!
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The Lab
Anwar Luc Stefano Michele Mary Koji Christina Andrea Ken
HOL talk in 2004
2011(student)
Robert Jim Sarah
Vadim and Joe (machine shop)
http://physics.rockefeller.edu/
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Backup
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Accelerator and CR experiments M212 ~ 7.9x10-5 eV2.
From cosmology:CMB and large scale structure experiments Σ =0.03<m1+m2+m3.<0.05eV
Neutrino mass hierarchy problem
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OPERA - 1
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OPERA – 2
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The MiniPlugs @ CDF
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Threading the MiniPlug fibers
About 1500 wavelength shifting fibers of 1 mm dia. are ‘strung’ through holesdrilled in 36x¼” lead plates sandwiched between reflective Al sheets and guided
into bunches to be viewed individually by multi-channel photomultipliers.
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History of the Universe
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Blow-hole at Grand Cayman
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p-p InteractionsDiffractive:
Colorless exchange with vacuum quantum numbers
Non-diffractive:Color-exchange
Incident hadrons retain their quantum numbersremaining colorless
pseudo-DECONFINEMENT
Incident hadrons acquire colorand break apart
CONFINEMENT
POMERON
Goal: understand the QCD nature of the diffractive exchange
rapidity gap
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Dark Energy
P(y) is exponentially suppressed
dy
dNρ,ey)P( particlesΔyρ
Rapidity gaps are formed bymultiplicity fluctuations:
Non-diffractive interactions
Δy2εe~0ty)P(
2lnlnln Msy
Rapidity gaps at t=0 grow with y:
Diffractive interactions
2: negative particle density!
Gravitational repulsion?http://physics.rockefeller.edu/dino/myhtml/talks/goulianos_konstantin_eds09_discussion.pdf
http://physics.rockefeller.edu/dino/myhtml/conference.html
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Grant Unification