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Konrad Tywoniuk University of Oslo Collaborators: A. Capella E.G. Ferreiro A.B. Kaidalov XLIII Recontres de Moriond – QCD and High Energy Interactions Matter is opaque – strong suppression There is a large azimuthal asymmetry of the suppression Particles ”flow”... Flow saturates where suppression saturates! 12.03.2008 XLIII Recontres de Moriond 2 Reaction plane z Matter formed in the collsion is a perfect liquid with (almost) no viscosity Hydrodynamical picture works Initial eccentricity is effectively transformed into momentum anisotropy of final state particles Jets that traverse the thermalized medium radiates y → energy loss ~ρL2 x Thermalization is reached within 0.5 fm after the initial moment of collision Is it possible to formulate a model without these assumptions that give the same experimental features? 12.03.2008 XLIII Recontres de Moriond 3 Small interaction cross sections (σ ~ 1 mb) in the final state Capella, Salgado PRC60(1999)054906 Capella, Ferreiro EPJC42(2005)419; φ enhancement Capella et al. arXiv:0712..4331 J/ψ suppression Capella, Ferreiro, Kaidalov, Azimuthal can easily introduced! Sousabe EPJC40(2005)129 high-pT dependence particle suppression Based on rate equations – Rdoes not rely on N N co co thermlization assumption R 12.03.2008 XLIII Recontres de Moriond 4 Capella, Ferreiro EPJC42(2005)419 CENTRALITY AND AZIMUTHAL ANGLE DEPENDENCE OF RAA IS ALSO OK! CENTRALITY DEPENDENCE OF V2 IS OK! MASS DEPENDENCE OF ELLIPTIC FLOW COMES NATURALLY... 12.03.2008 XLIII Recontres de Moriond 5 o calculations for v2 at LHC are being computed for realistic case o RAA(Δφ) is well reproduced! o v2 @ LHC ~ 1.5 v2 @ RHIC → due to strong final state suppression 12.03.2008 XLIII Recontres de Moriond 6 New method of calculating the suppression along the path of the particle Can check dijet correlations Zhang, Owens, Wang, Wang PRL98(2007)212301 12.03.2008 XLIII Recontres de Moriond 7 Bhalerao, Blaizot, Borghini, Ollitrault PLB627(2005)49 Drees, Feng, Jia PRC71(2005)034909 12.03.2008 XLIII Recontres de Moriond 8