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Jin-HuiChenShanghaiInstituteofAppliedPhysics,CASIn.ppt

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Jin-HuiChenShanghaiInstituteofAppliedPhysics,CASIn.ppt

Jin-Hui ChenShanghai Institute of Applied Physics, CASIn collaboration with F. Jin, D. Gangadharan, X. Cai, H. Huang and Y. Ma Parton distributions at hadronization from bulk dense matter produced at RHIC 2Outlinel Introduction and Motivation– Phenomena RHIC in favor of quark Coalescence/Recombination mechanisml Results and Discussions– Constituent quark pT distribution at hadronization – s/d quark ratio at hadronization– Parton freeze-out properties – Dynamical model calculationl Summary and Outlook3pT dependence physical process0 1 2 3 4 5 6 7 8 9 10 11 12 GeV/cpQCDReCoHydroRCPSTAR RunII AuAu 200 GeVl pT dependence physical process at RHICl We will focus on the intermediate pT region, and let’s visit the data again4Intriguing phenomena at RHIC ---- large p/p ratiol Unexpected large p/p ratio at intermediate pT in central AuAu collisions– The hadronization scheme at RHIC must be different from ee- 5Intriguing phenomena at RHIC ---- v2,RCP groupingl V2 and RCP measurements for identified particles show a B/M grouping behavior at intermediate pT – NCQ-scaling, partonic degrees of freedomNCQ3NCQ26What can we learn from those phenomenaAt RHIC intriguing experimental features– enhanced baryon over meson production– strong elliptic flow– B/M type grouping behavior of v2 and RCP for indentified particlesl Hadronization of bulk dense matter created at RHIC must be different from ee- collisionsl Evidence for quark Coal/RecoThe essential degrees of freedom at hadronization seem to be effective constituent quarks that have developed a collective flow during the partonic evolution. – v2/nq represents the constituent quark v2, what about the constituent quark pT distribution– p,K,p large resonance decay and hadronic re-scattering effect.– our approach is made possible because of high stat. W, f measurements. 7Focus on W and fl W and f are mostly from bulk s quarks;l Bulk s quarks have collective flow. Extract the s quarks pT distributions from high stat. W f dataSTAR RunIV AuAu 200 GeV8Parton pT distributions at hadronizationIf baryons of pT are mostly formed from coalescence of partons at pT/3 and mesons of pT are mostly formed from coalescence of partons at pT/2 [1,2,3]l W and f particles have no decay feed-down contribution.l These particles will freeze-out earlier from the system and have small hadronic re-scattering cross sections.[1] R.C. Hwa et al., Phys. Rev. C 66, 025205 2002;[2] V. Greco et al., Phys. Rev. Lett. 90, 202302 2003;[3] R.J. Fries et al., Phys. Rev. Lett. 90, 202303 2003.9l The constitute quark pT distributions have been extracted from the multi-strange data;l The s-quark shows a flatter pT distribution than the d-quark.Strange and light quark distributionl The s-quark and d-quark have a similar KET distribution partons have undergone a partonic evolution possibly described by hydrodynamics. 10s/d quark ratio from primordial hyperonl s/d ratio from hyperon X01530 feed-down[1] 46-14l Consistent s/d ratio derived from primordial hyperon data[2] B.I. Abelev et al., Phys. Rev. Lett. 97, 132301 2006;[3] S. Wheaton and J. Cleymans, J. Phys. G 31, S1069 2005;[4] M. Bleicher et al., J. Phys. G 25, 1859 1999; H.J. Drescher et al., Phys. Rep. 350, 93 2001.–S feed-down –S1385[2] 26-5.9;–S0 no data available yet–THERMUS[3] 36– String frag[4] 25[1] R. Witt, J. Phys. G 34, S921 2007;

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