Student Seminar Subatomic Physics
Herbert Löhner, Olaf Scholten, Johan Messchendorp
1st block, semester 1, 2009/2010
Wednesday 13:15-15:00
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:
“Non-perturbative Quantum Chromodynamics”
Physics at BES-III
Literature:
IHEP-Physics-Report-BES-III-2008-001-v1
http://arxiv.org/abs/0809.1869v1)
(
Editors: Kuang-Ta Chao and Yifang Wang
Website: t.b.a
with current info
What is BES III
Detector at the BEPCII accelerator in Bejing
BEPC=Bejing Electron Positron Collider at the
IHEP (Institute of High Energy Physics)
Operates at Ecm=2.0-4.2 GeV,
tau-lepton en charm-quark production
CERN courier, june 8, 2009: 100 million ψ(2S)
http://cerncourier.com/cws/article/cern/39149
1.1 The Status of the BEPC
2.1 The double ring structure of BEPCII
BESIII detector
Magnet:
- 0.4-0.5 T existing BESII magnet
- 1 T Super conducting magnet
MDC: small cell & He
gas
xy=130 m
p/p = 0.5% @1GeV
dE/dx=6%
TOF:
T = 80 ps Barrel
100 ps Endcap
EMCAL: CsI crystal
E/E = 2.5% @1GeV
z = 0.5 cm/E
Muon ID: 9 layer RPC
• Adapt to high event rate of BEPCII:
1033cm-2 s-1 and bunch spacing 8ns
• Reduce sys. errors to match high
statistics
• Increase acceptance
Trigger: Tracks & Showers
Pipelined; Latency = 2.4s
Data Acquisition:
Event rate = 3KHz
Thruput ~ 50 MB/s
Physics interest (1)
3 families
– quarks
– leptonen
Physics interest (2)
What is structure states???
• 1/mc may serve as perturbation parameter
• Charmed states are distinct in Energy
• CP-violation laboratory
– (shows primarily in decays)
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
N-2
discuss outline material
present overview presentation
give the group a tutorial reference (~5 pages)
N-1
1st trial presentation
N
Monday
2nd trial presentation
N
Wednesday Presentation
Topics / chapters
2 The BES-III detector and offline software
3.1 Monte Carlo Generators
3.3 Particle Identification
3.4 Kinematic Fitting
3.5 Partial Wave Analysis
3.6 Dalitz-plot Analysis Formalism
4 Physics Processes and Radiative Corrections
5 Hadronic fragmentation
6 R values and precision test of the Standard Model
7 Experimental tests of QCD
9 - 9.3 Meson spectroscopy (conventional mesons, glue balls)
9.4 - 9.6 Meson spectroscopy (hybrids, multi-quarks, molecules)
10 Baryon spectrum
11 Physics of soft pions (PCAC)
13 Theoretical Frameworks of Charmonium Physics (NRQCD)
14 Charmonium Spectroscopy
15 Charmonium transitions 15.1-15.2 Hadronic and radiative tr.
15.3-15.4 channels for new exp.s
17 Radiative decays
22 Leptonic, semileptonic D(DS) decays and CKM matrix
25 D0 − D0 Mixing
26 CP and T Violation
29 Tau Decays
9 - 21
60 - 70
70 - 77
103 - 109
111 - 132
173 - 200
200 - 232
233 - 250
251 - 265
295 - 303
305 - 324
327 - 344
344 - 364
379 - 391
627 - 656
657 - 671
Hadronic fragmentation
Figure 5.3: (a) String fragmentation in time-longitudinal phase-space by
a set of new pairs (q¯q or q¯qq¯q) production, hadrons (mesons M and
baryons B) form at the vertices;
(b) the vertex V divides the n-body string fragmentation into two
clusters that contain n1 and n2 hadrons with squared invariant masses
s1 and s2.
R values and precision test of the Standard
Model
Figure 6.1: Rhad versus cms energy.
Measurements are shown with statistical
errors. The relative uncertainty assigned to
the parameterization is shown as a band
and given with numbers at the bottom (from
Ref. [43]).
Running of the EM coupling constant
Meson spectroscopy
(Glue Balls)
Figure 9.1: The mass spectrum of
glueballs in pure SU(3) gauge theory. The
masses are given both in terms of r0 (r−10 =
410MeV) and in GeV. The thickness of
each colored box indicates the statistical
uncertainty of the mass.
Meson spectroscopy
(hybrids, multi-quarks, molecules)
Figure 9.24: The η′π+π− invariant
mass for J/ψ → γη′π+π−. The
generated signals and
backgrounds are normalized to 3
× 109J/ψ events and are added
incoherently.
Baryon spectrum
Figure 10.3: Various pictures for internal quark-gluon structure of
baryons: (a) qqq, (b) qqqg hybrid, (c) diquark, d) meson-baryon
state, (e) pentaquark with diquark clusters.
Physics of soft pions (PCAC)
Figure 11.7: The Kπ invariant mass
recoiling against a K∗. The crosses
are data and histograms represent
the PWA fit projection. The shaded
area shows the κ contribution.
Non-Relativistic QCD Effective Field Theory
(NRQCD)
Table 13.1: Different recent
determinations of mb(mb) and mc(mc) in
the MS scheme from the bottomonium
and the charmonium systems. The
displayed results either use direct
determinations or non-relativistic sum
rules. Here and in the text, the ∗
indicates that the theoretical input is
only partially complete at that order.
Charmonium Spectroscopy
Figure 14.1: Predicted and
observed spectrum of
charmonium states (Table 14.2).
The solid lines are experiment for
reasonably well-established
charmonium states.
Charmonium transitions
Figure 15.4: Radiative transitions between
charmonium states below the open charm
threshold.
Figure 15.5: Hadronic transitions of
ψ′ to other charmonium states.
Radiative decays; Alpha(S)
Figure 17.1: Direct contributions in the
weak coupling regime. The solid green line
corresponds to the calculation for the
central region at NLO, which should be
reliable up to z < 0.7 . The blue dot-dashed
line corresponds to the calculation for the
upper end-point region, which is expected
to provide a reasonable model for 0.7 < z <
0.9. The red dashed line is the curve
obtained by merging.
D0 − D0 Mixing
Figure 25.1: Standard Model box diagrams
of flavor-changing neutral currents
contributing to D0 − D0 mixing at the quark
level.
CP and T Violation
Table 26.1: Measurements of CP
violating asymmetries in neutral D
decays in different modes.
Topics / chapters
2 The BES-III detector and offline software
3.1 Monte Carlo Generators
3.3 Particle Identification
3.4 Kinematic Fitting
3.5 Partial Wave Analysis
3.6 Dalitz-plot Analysis Formalism
4 Physics Processes and Radiative Corrections
5 Hadronic fragmentation
6 R values and precision test of the Standard Model
7 Experimental tests of QCD
9 - 9.3 Meson spectroscopy (conventional mesons, glue balls)
9.4 - 9.6 Meson spectroscopy (hybrids, multi-quarks, molecules)
10 Baryon spectrum
11 Physics of soft pions (PCAC)
13 Theoretical Frameworks of Charmonium Physics (NRQCD)
14 Charmonium Spectroscopy
15 Charmonium transitions 15.1-15.2 Hadronic and radiative tr.
15.3-15.4 channels for new exp.s
17 Radiative decays
22 Leptonic, semileptonic D(DS) decays and CKM matrix
25 D0 − D0 Mixing
26 CP and T Violation
29 Tau Decays
9 - 21
60 - 70
70 - 77
103 - 109
111 - 132
173 - 200
200 - 232
233 - 250
251 - 265
295 - 303
305 - 324
327 - 344
344 - 364
379 - 391
627 - 656
657 - 671
Schedule Student Seminar Subatomic Physics 2009: Non-perturbative QCD
date
2 sept.
9 sept.
Topic
Speaker(s)
Introduction
OS
Panda meeting in FZ Juelich (preparation of subjects, no seminar)
Coach
16 sept. Detector properties
Ganesh Tambave
Vanni Jothi
JM
23 sept.
Meson spectroscopy
(conventional mesons, glue balls)
Hanna Renkema
Meike Door
OS
30 sept.
Meson spectroscopy
(hybrids, multi-quarks, molecules)
Samuel Hoekman T.HL
Zorione Herrasti
7 oct.
D0 − D0 Mixing
Niels vd Vegte
Roel Tempelaar
OS , JM
Hans Kuipers
Maikel de Vries
OS , JM
14 oct.
21 oct.
28 oct.
Charmonium transitions
Theoretical Frameworks of
Charmonium Physics (NRQCD)
Tom Boot
Victor Haverkort
CP and T Violation
Wouter Dekens
Gianluca Inguglia (?)
HL
OS , JM