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.