探索新物质形态——夸克胶子等离子体.PPTVIP

Round Table Workshop on NICA Physics Dubna,September 9-12,2009 J/Ψ Production in Heavy Ion Collisions Pengfei ZHUANG Tsinghua University, Beijing Introduction J/Ψ at SPS J/Ψ at RHIC J/Ψ at NICA thanks for your attention * * ● produced only in the initial impact, and no extra production in the later evolution a probe of early thermalization and a probe of QGP ●produced via hard process rather solid ground importance of heavy quarks B.Mueller, nucl-th/0404015 Matsui and Satz 1986: J/Ψ suppression as a signature of QGP formation in HI ● both initial production and regeneration ● both normal suppression and anomalous suppression J/Ψ motion in heavy ion collision hot nuclear matter effects cold nuclear matter effects J/Ψ at SPS: normal suppression mechanism: multi-scattering between J/Ψ and spectator nucleons R.Vogt, Phys.Rept.310, 197(1999) C.Gerschel, J.Hufner, Annu.Rev.Nucl.Part.Sci. 49, 225(1999) conclusion: nuclear absorption can well explain the J/Ψ yield in p-A and light nuclear collisions at SPS energy ! NA38 model 1: Debye screening (Matsui Satz, 1986) NA38 at T=0 at T≠ 0 J/Ψ at SPS: anomalous suppression model 2: threshold model (Blaizot, Dinh, Ollitrault, 2000) model 3: comover interaction Capella, Feir