Raport z konferencji EPS2003 w Akwizgranie

Raport z konferencji EPS2003 w Akwizgranie Jan Paweł Nassalski Instytut Problemów Jądrowych im. A.Sołtana Seminarium IFD UW

17-23 lipca 2003 • ~ 500 uczestników • ~9 z Polski; • Prezentacje: B.Badełek, J.Ukleja, M.Krawczyk, M.Różańska, • F.Żarnecki, A.Trzupek • Konwenerzy B.Wosiek „High energy nuclear physics” • M.Turała „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 Seminarium IFD UW

SESJE #prezentacji • Hard QCD ………………………………. 51 • Hadronic physics ………………………. 35 • Heavy flavour physics ……………….. 31 • Physics beyond the Standard Model .. 30 • Tests of the Standard Model ………… 30 • Physics beyond the Standard Model .. 30 • Detectors and data handling ………… 24 • Neutrino Properties and oscillations 21 • CP violation ……………………………. . 19 • High energy nuclear physics …………17 • Particle astrophysics – dark matter ….10 • Accelerator R&D ……………………….. 10 • Particle astrophysics – cosmic rays … 9 • String theory and extra dimensions …. 8 • Non perturbative field theory ………… 7 Seminarium IFD UW

1 Seminarium IFD UW

Seminarium IFD UW

2 Seminarium IFD UW

Seminarium IFD UW (Laser-Electron Photon facility at SPring-8 γ12C →K- K+ X) (ITEP 0.85 GeV K+ Xe → K0 p Xe’)

(S=+1) Seminarium IFD UW (JLAB: 3-5.25 GeV γ)

(F.Wilczek) Seminarium IFD UW

SAPHIR Collaboration: 1.7-2.7 GeV γ p -> n K+ K0s Seminarium IFD UW

(of Frank Wilczek presentation) Seminarium IFD UW

3 Relativistic Heavy Ion Physics: An Experimental Review Saskia Mioduszewski 22 July 2003 Seminarium IFD UW

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 Seminarium IFD UW

Nuclear Modification Factor RAA • in absence of nuclear effects • RAA < 1 at low pT (soft physics regime) • RAA = 1 at high pT (hard scattering regime) • “suppression” (enhancement, e.g. Cronin effect) • RAA < 1 (> 1) at high pT Nuclear Modification Factor <Nbinary>/sinelp+p NN cross section Seminarium IFD UW

RAA for p0 By definition, processes that scale with Nbinarywill produce RAA=1. RAA is what we measure divided by what we expect. Nbinary-scaling RAA is < 1 at RHIC, but > 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 Seminarium IFD UW

comparison with model calculations with and without parton energy loss Levai without parton energy loss Wang Wang with parton energy loss Vitev Levai 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). Seminarium IFD UW Au+Aup0+X at sNN = 200 GeV

BRAHMS, Z. Yin, this conference d+Au Au+Au RAA vs. RdA for charged hadrons and p0 Initial State Effects Only PHENIX (d+Au) hep-ex/0306021 submitted to PRL Initial + Final State Effects No Suppression in d+Au, 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 Seminarium IFD UW

Au+Au peripheral Au+Au central pedestal and flow subtracted ? Phys Rev Lett 90, 082302 Azimuthal distributions in Au+Au Near-side: peripheral and central Au+Au similar to p+p Strong suppression of back-to-back correlations in central Au+Au collisions Seminarium IFD UW

pedestal and flow subtracted Azimuthal distributions Near-side: p+p, d+Au, Au+Au similar Back-to-back: Au+Au strongly suppressed relative to p+p and d+Au Suppression of the back-to-back correlation in central Au+Au is a final-state effect Seminarium IFD UW

4 S. StoneSyracuse Univ.July 2003 Experimental Results in Heavy Flavor Physics Many references not properly cited here. Apologies in advance. Far too much interesting Material to include in 45 min. Apologies in advance. Seminarium IFD UW

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! Seminarium IFD UW

Some basics: b Lifetimes • Note ratio tB+/tBo =1.073±0.014, 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 Seminarium IFD UW

Some basics: Charm lifetimes (charm photoproduction at FERMILAB) • New precise lifetimes from FOCUS, a challenge to QCD (from Pedrini) Seminarium IFD UW

Narrow Ds** States • Ds** (c & s in l=1 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 2316.8±0.4±3.0 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 Seminarium IFD UW

CLEO Sees Two States 2.32 GeV 2.11 GeV • Confirms the BaBar observation of Ds(2317) (13.5 fb-1) • s= MeV • Detector resolution: 6.0±0.3 MeV • 165±20 events in peak Dsp0 Seminarium IFD UW

Raport z konferencji EPS2003 w Akwizgranie

Raport z konferencji EPS2003 w Akwizgranie

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