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Experimental conference summary

This summary provides an overview of the general features observed in RHIC collisions, including particle multiplicity, energy density, stopping power, electromagnetic dissociation, anisotropic flow, inverse slopes, HBT correlations, strangeness production, charmonium, low mass dileptons, and high energy photons. It also discusses unresolved issues and open questions in these areas.

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Experimental conference summary

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  1. Experimental conference summary • General features of RHIC collisions • Particle multiplicity • Energy density • Stopping • E-M dissociation • From SPS to RHIC • Anisotropic flow • Inverse slopes • HBT • Strangeness • Open issues • Charmonium • Dielectrons • Photons • Energy loss IWPQGP 2001, Sept. 7 th

  2. Multiplicity with quenching STAR PHENIX BRAHMS No jet quenching • RHIC 130 GeV B. Jacak IWPQGP 2001, Sept. 7 th

  3. Multiplicity BRAHMS 200 AGeV Syst Theory 1999 PHOBOS 2001 PHOBOS 2000 PRL 85 (2000) 3100 & nucl-ex/0108009 • RHIC 200 GeV • The increase is moderate … • Good news for LHC people M.Baker, J.J.Gaardhoje IWPQGP 2001, Sept. 7 th

  4. Multiplicity BRAHMS 200AGEV 200 GeV PHOBOS 130 GeV PHOBOS UA5 200 GeV Data from nucl-ex/0108009 • BRAHMS: • Central 0-6% •  N(ch)d= 5100±300 • dN(ch)/d (=0) =61050 • FWHM of distribution = 7.9  1.0 M.Baker, J.J.Gaardhoje IWPQGP 2001, Sept. 7 th

  5. Energy density • e 4.6 GeV/fm3 • >50% higher thanat CERN Phenix 130 GeV B. Jacak IWPQGP 2001, Sept. 7 th

  6. Stopping • Antiproton/proton ratio P.Jones, J.J.Gaardhoje IWPQGP 2001, Sept. 7 th

  7. Stopping pbar/p Preliminary PHENIX 130 GeV preliminary BRAHMS 130 GeV • More stopping in central collisions • No PT dependence of pbar/p ratio B.Jacak, J.J.Gaardhoje, P.Jones IWPQGP 2001, Sept. 7 th

  8. Electromagnetic dissociation n n 1n EM dissociation selected by ZDC coincidences and TMA Veto in BRAHMS n NLO 2n LO • Important issue for luminosity measurement & LHC J.J.Gaardhoje IWPQGP 2001, Sept. 7 th

  9. Anisotropic flow • Ex.: NA49 A.Poskanzer IWPQGP 2001, Sept. 7 th

  10. Anisotropic flow PRL 86, (2001) 402 || < 1.3 0.1 < pt < 2.0 SPS AGS RQMD • RHIC: V2 component (elliptic flow) STAR P.Jones, A.Poskanzer IWPQGP 2001, Sept. 7 th

  11. Anisotropic flow • Anisotropy shows a clear centrality and PT dependence R.Lacey IWPQGP 2001, Sept. 7 th

  12. HBT • Source size systematics does not exhibit qualitative differences fro SPS to RHIC P.Jones IWPQGP 2001, Sept. 7 th

  13. HBT • STAR F.Retiere IWPQGP 2001, Sept. 7 th

  14. Inverse slopes • SPS and RHIC results K.Safarik, D.Rohrich IWPQGP 2001, Sept. 7 th

  15. Inverse slopes & HBT  p K- At chi square minimum Tth = 0.13[GeV] <r > = 0.52 [c] Tth[GeV] - 0 0.4 0 0.4 <r > [c] • @ SPS, Tfo  100 MeV, <v>  0.55c • Tfo somewhat higher @ RHIC P.Jones IWPQGP 2001, Sept. 7 th

  16. Strangeness SPS • Kaons @ RHIC • Increase with centrality • Not qualitatively different from SPS P.Jones, C.Roy IWPQGP 2001, Sept. 7 th

  17. Strangeness • Strange baryons : onset ? K.Safarik IWPQGP 2001, Sept. 7 th

  18. Strangeness • New proton nucleus data • Onset or continuous increase ? K.Kadjia IWPQGP 2001, Sept. 7 th

  19. Strangeness • Energy dependence ? • Maximum ~ 40 GeV ? M.Gazdzicki IWPQGP 2001, Sept. 7 th

  20. Strangeness • Rhic results P.Jones, C.Roy IWPQGP 2001, Sept. 7 th

  21. Charmonium • Interpretation of the NA50 results • Problem with low Et • Data > normal absorption ??? • Comovers far above normal absorption • How does it reproduce S-U and p-A ? • NA50 Y2K data … A.Romana IWPQGP 2001, Sept. 7 th

  22. Charmonium • How well do we know J/y prod ? • p-A • Nucl. absorption cross section • p-y cross section • Color octet • New results expected • NA50 Y2K data • PHENIX • NA60, lighter ions • Which interpretation for charmonium production @ LHC ? • Recombinations • Feed-down from beauty decay • Thermal production ? M.Leitch IWPQGP 2001, Sept. 7 th

  23. Low mass dileptons • Last CERES result @ 40 GeV D.Miskowiec IWPQGP 2001, Sept. 7 th

  24. Low mass dileptons • NA60 can provide new elements E.Scomparin IWPQGP 2001, Sept. 7 th

  25. Direct photons WA98 T.Awes IWPQGP 2001, Sept. 7 th

  26. High PT • High PT depletion in hadron spectra • With respect to p-p • Central wrt peripheral B.Jacak IWPQGP 2001, Sept. 7 th

  27. High PT Preliminary QM01 Preliminary QM01 • Clearly seen by both STAR & PHENIX P.Jones IWPQGP 2001, Sept. 7 th

  28. conclusion • RHIC : Particle multiplicity not as high as expected few years ago • So far, no big surprise with • Enegy density • Stoping • Flow • Expansion • Strangeness ?? • Open issues • Charmonium • Low mass dileptons • Photons • Jet Quenching promising issue² IWPQGP 2001, Sept. 7 th

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