Student Seminar Subatomic PhysicsHerbert Löhner, Olaf Scholten, Johan Messchendorp
1st block, semester 1, 2008/2009 Wednesday 15:15-17:00
This course is given in the style of a seminar with an introduction by the
lecturers and presentations given by the participants. A topic of high
current interest in subatomic physics will be studied by discussing review
articles from recent literature. Participants will be supervised by the
instructors in individually arranged coaching sessions in preparing their
specific contribution for the presentation.
Current topic:
Physics of Charm
Literature:S. Bianco, F.L. Fabbri, D. Benson, I. Bigi,
A Cicerone for the Physics of Charm.( hep-ex/0309021)
Website: t.b.awith current info
S. Bianco, F.L. Fabbri, D. Benson, I. Bigi, A Cicerone for the Physics of Charm, (hep-ex/0309021)
• history of charm physics• student contributions on different theoretical approaches,
experimental issues and results
KVI interests: Fundamental interactions & symmetries, Hadron physics in relation to GSI program
Student Seminar, Grading Criteria
Preparation:
Making use of proposed literature
Incorporating additional literature
Understanding of the subject matter
Depth of the presentation
Structure of the presentation
Presentation:
Formulation of stimulating questions
Answering questions from audience
Presentation technique
Quality of slides
Time management
Participation:
Presence during seminar hours
Active participation during seminar hours
Contributing questions before the seminar sessions
Answering questions at the end of seminar sessions
Final written exam, based on presented material;vrijstelling mogelijk bij voldoende resultaat wekelijkse deelname
Seminar Preparation Timeline
week
N-3 discuss outline material
N-2 present overview presentation
N-1 1st trial presentation
N Monday 2nd trial presentation
N Wednesday Presentation
Schedule date Topic Coordinator Speaker(s)3 sept Introduction- overview and assignment of subjects
O.S.
10 sept. Panda meeting in Ferrara - 17 sept. Theory; The Quark & Bag Models (4.1)
O.S./J.M.
24 sept. Theory; Effective Field Theory (4.3)O.S.
1 oct. Theory;- Lattice QCD (4.9)O.S.
8 oct. Production Dynamics (5)- H.L..
15 oct. Spectroscopy (6) – The spectrum of charmed mesons H.L.
22 oct. Decays (7,8,9) - What can be learned from decays J.M.
29 oct. Oscillations (10) – Mixing between D and anti-D
J.M.
5 nov. CP violation (11)H.L.
Physics of Charm
aim:
set context for this lecture series
subject:
role of charm in standard model
Mass3 families
– quarks– leptonen
History of Charm
First Evidence: Charge current operator and splitting of KL and KS
Data suggested mc = 2 GeV (In these days the quark model was not yet accepted!!)
1971: First evidence for charmed mesons in cosmic-ray emulsion experiment.
1974, october: Discovery of Charmonium, J/Ψ (Jpc=1--) by Ting (BNL) and Richter (SLAC), a state at 3.1 GeV with a very narrow width.
1974, D-mesons as narrow states in K+π
Since: spectrum of Charmonium and charmed mesons
Charmonium Spectrum
3 GeV
3.8 GeV
J/
(2S) or ’
3S1
3S1
3P2
3P1
3P0
2
1
0
Charmonium is a bound stateof a charmed quark andantiquark. It is “almostnonrelativistic”: ~ 0.4:Hence the hydrogen atom-likespectrum
Mas
s
thresholdDD
Review: Quantum Numbers
JS L12
Total Angular Momentum
Orbital Angular Momentum
Spin Angular Momentum 1
3/ SJ Means: Quark Spin=1 (3 = 2 x 1 + 1) Quark Orbital Ang. Mom. = 0 Total J/ Spin = 1
1PCJMeans: Total J/ Spin = 1 Parity is Odd Charge Conjugation is Odd
Quarkonium Potential
A not-too-terrible model of the quark-antiquark force law:
Brr
AF
2
A Coulomb-like part
A spring-like part
This piece comes from the non-Abelian nature of QCD: the fact that you have 3-gluon and 4-gluon couplings.
In QED, there is no coupling, sothis term is absentThis is just like QED:
(sometimes called the“chromoelectric”
force)
4 E
QCDQCDE 4
Charmonium Spectrum Revisited
From: Brian Fulsom, 2007
Ted Barnes, Int. J. Mod. Phys. A21 (2006) 5583 hep- ph/0608103v1
Basic Interests
• 1/mc may serve as perturbation parameter
• Charmed states are distinct in Energy• CP-violation laboratory
– (shows primarily in decays)
What is structure states???
Schedule date Topic Coordinator Speaker(s)3 sept Introduction- overview and assignment of subjects
O.S.
10 sept. Panda meeting in Ferrara - 17 sept. Theory; The Quark & Bag Models (4.1)
O.S./J.M.
24 sept. Theory; Effective Field Theory (4.3)O.S.
1 oct. Theory;- Lattice QCD (4.9)O.S.
8 oct. Production Dynamics (5)- H.L..
15 oct. Spectroscopy (6) – The spectrum of charmed mesons H.L.
22 oct. Decays (7,8,9) - What can be learned from decays J.M.
29 oct. Oscillations (10) – Mixing between D and anti-D
J.M.
5 nov. CP violation (11)H.L.