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Raport z konferencji EPS2003 w Akwizgranie
Jan Pawel Nassalski Instytut Problemów Jadrowych
im. A.Soltana
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• 17-23 lipca 2003
• 500 uczestników
• 9 z Polski
• Prezentacje B.Badelek, J.Ukleja, M.Krawczyk,
  M.Rózanska,
• F.Zarnecki, A.Trzupek
• Konwenerzy B.Wosiek High energy nuclear
  physics
• M.Turala Detectors
  and data handling
• JPN CP
  violation

• Nagrody

• High Energy Particle Physics Prize of EPS to
• David Gross, David Politzer, and Frank
  Wilczek
• Gribov Medal to Nima Arkani-Hamed, Harvard
• Young Particle Physicist Award to Guillaume
  Unal
• Outreach Prize to Rolf Landua, and Nicholas
  Tracas

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SESJE
prezentacji

1. Hard QCD . 51
2. Hadronic physics . 35
3. Heavy flavour physics .. 31
4. Physics beyond the Standard Model .. 30
5. Tests of the Standard Model 30
6. Physics beyond the Standard Model .. 30
7. Detectors and data handling 24
8. Neutrino Properties and oscillations 21
9. CP violation . . 19
10. High energy nuclear physics 17
11. Particle astrophysics dark matter .10
12. Accelerator RD .. 10
13. Particle astrophysics cosmic rays 9
14. String theory and extra dimensions . 8
15. Non perturbative field theory 7

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(Laser-Electron Photon facility at SPring-8 ?
12C ?K- K X)
(ITEP 0.85 GeV K Xe ? K0 p Xe)
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(S1)
(JLAB 3-5.25 GeV ?)
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(F.Wilczek)
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SAPHIR Collaboration 1.7-2.7 GeV ? p -gt n
K K0s
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(of Frank Wilczek presentation)
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Relativistic Heavy Ion Physics An Experimental
Review
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Saskia Mioduszewski
22 July 2003
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Summary

• Physics highlights
• Strong collective expansion at SPS and RHIC
• Evidence for early equilibration at RHIC
• SPS Anomalous J/? suppression
• Enhancement of low-mass
  dileptons
• RHIC Suppression of high pT particles
• and disappearance of away-side
  jet
• Very intriguing results. All consistent with QGP
  formation

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Nuclear Modification Factor RAA
Nuclear Modification Factor
ltNbinarygt/sinelpp
NN cross section

• in absence of nuclear effects
• RAA lt 1 at low pT (soft physics regime)
• RAA 1 at high pT (hard scattering regime)
• suppression (enhancement, e.g. Cronin effect)
• RAA lt 1 (gt 1) at high pT

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RAA for p0

• By definition, processes that scale with Nbinary
  will produce RAA1.
• RAA is what we measure divided by what we expect.

Nbinary-scaling
RAA is lt 1 at RHIC, but gt 1 at SPS SPS Cronin
effect dominates RHIC suppression dominates
A.L.S.Angelis PLB 185, 213 (1987) WA98, EPJ C 23,
225 (2002) PHENIX, PRL 88 022301 (2002) PHENIX
submitted to PRL, nucl-ex/0304022
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Jet Quenching ?

• high pT suppression reproduced by models with
  parton energy loss
• other explanations not ruled out, need to measure
  initial-state effects

Wang X.N. Wang, Phys. Rev. C61, 064910
(2000). Levai P.Levai, Nuclear Physics A698
(2002) 631. Vitev I. Vitev and M. Gyulassy,
hep-ph/0208108 Gyulassy, Levai, Vitev, Nucl.
Phys. B 594, p. 371 (2001).
AuAu?p0X at ?sNN 200 GeV
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RAA vs. RdA for charged hadrons and p0
Initial State Effects Only
PHENIX (dAu) hep-ex/0306021 submitted to PRL
Initial Final State Effects

• No Suppression in dAu, instead small enhancement
  observed (Cronin effect)!!
• d-Au results rule out initial-state effects as
  the explanation for Suppression at Central
  Rapidity and high pT

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Azimuthal distributions in AuAu
Near-side peripheral and central AuAu similar
to pp
Strong suppression of back-to-back correlations
in central AuAu collisions
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Azimuthal distributions
Near-side pp, dAu, AuAu similar Back-to-back
AuAu strongly suppressed relative to pp and dAu
Suppression of the back-to-back correlation in
central AuAu is a final-state effect
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S. StoneSyracuse Univ.July 2003
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• Experimental Results in Heavy Flavor Physics

Far too much interesting Material to include in
45 min. Apologies in advance.
Many references not properly cited here.
Apologies in advance.
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Conclusions

• There have been lots of surprises in Heavy Quark
  Physics, including
• Long b Lifetime
• Bo Bo mixing
• Narrow Ds states
• Now finding the effects of New Physics in b c
  decays would not be a surprise - we expect to do
  it!

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Some basics b Lifetimes

• Note ratio tB/tBo
• 1.0730.014, a
• 5.2s difference
• Also tL ? tBo
• According to
• proponents of the
• Heavy Quark Expansion model, there should be
  at most a 10 difference between b-bayron Bo
  lifetimes

b
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Some basics Charm lifetimes
(charm photoproduction at FERMILAB)

• New precise lifetimes from FOCUS, a challenge to
  QCD (from Pedrini)

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Narrow Ds States

• Ds (c s in l1 states) predicted Jp 0, 1,
  1 2. One 1 2 previously seen, these decay
  into D()K, are relatively narrow. Others are
  also predicted to be above D()K threshold and
  have large 200 MeV widths
• BaBar Narrow peak in Dspo
• mass distribution. Mass is
• 2316.80.43.0 MeV, width
• consistent with mass resolution
• 9 MeV
• Lighter than most potential
• model predictions. Mass is
• 40 MeV below DK threshold

BABAR 91 fb-1
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CLEO Sees Two States
2.32 GeV
2.11 GeV
Ds p0

• Confirms the BaBar observation of Ds(2317) (13.5
  fb-1)
• s MeV
• Detector resolution 6.00.3 MeV
• 16520 events in peak

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CLEO finds new state near 2460 MeV
2.46 GeV

• See 2nd state decaying
• into Dspo, at 2460 MeV
• s 6.11.0 MeV
• Detector res 6.60.5 MeV
• 5510 events in peak

Ds p0
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Belle Confirms Both States

Ds sidebands
M(Ds p0 )-M(Ds)
M(Ds p0 )-M(Ds)
(See Seusters talk)
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Other Charge States Not Seen

• CLEO Ds p- or Ds p not seen at level more than
  factor of 10 lower than Ds p- speaks against
  molecule. Also

CLEO

2317
CDF
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Possible Explanations

• DK molecule Barnes, Close Lipkin hep-ph/0305025
• Ordinary excited cs states Ds, narrow
  because isospin is violated in the decay (is only
  way for hadronic decay to occur since its below
  DK threshold - see Cho Wise). Use HQET chiral
  symmetry to explain. Bardeen, Eichten Hill
  hep-ph/0305049. Also Nowak, Rho Zahed
  hep-ph/0307102 (cs states are all I0, p is I1)
• Colangelo De Fazio hep-ph/0305140 Godfrey
  hep-ph/0305122 ask us to look for radiative
  decays such transitions support cs
• Van Beveran Rupp explain in terms of unitarized
  meson model hep-ph/0305049
• Bali says lattice cannot accommodate these as cs
  states hep-ph/0305049, however this claim is
  disputed, Dougall et al hep-ph/0307001
• Dai, Huang Zhu hep-ph/0306274 show that the
  masses can be obtained using QCD sum rules
• Browder et. al, mixture with 4-quark state above
  DK threshold hep-ph/0307054

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Struktura nukleonu
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Z Podsumowania, D.Treille
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