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Di-hadron correlation and Mach-like cone structures in partonic/hadronic transport model

Di-hadron correlation and Mach-like cone structures in partonic/hadronic transport model. Guo-Liang Ma. Shanghai Institute of Applied Physics . Collaborators: S. Zhang, Y. G. Ma, H. Z. Huang, X. Z. Cai, J. H. Chen, Z. J. He, J. L. Long, W. Q. Shen, X. H. Shi et al. Background introduction

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Di-hadron correlation and Mach-like cone structures in partonic/hadronic transport model

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  1. Di-hadron correlation and Mach-like cone structures in partonic/hadronic transport model Guo-Liang Ma Shanghai Institute of Applied Physics  Collaborators: S. Zhang, Y. G. Ma, H. Z. Huang, X. Z. Cai, J. H. Chen, Z. J. He, J. L. Long, W. Q. Shen, X. H. Shi et al. • Background introduction • Model introduction • Analysis method • Results and discussions • Conclusion nucl-th/0601012 Guo-liang Ma Hard Probes Asilomar 2006

  2. Associated particles On away side: pT(assoc) > 2 GeV/c Hard associated particles → suppression 4 < pT(trig) < 6 GeV/c pT(assoc) > 0.15 GeV/c Soft associated particles→ enhancement Di-hadron correlations

  3. <pT> from away jets near side SOFTENED BROADENED <pT> from medium decay thermalization??? away side BROADENED SOFTENED Soft Associated particles on Away side (thermalization) What happens to a hard probe that traverses a colored medium? soften + broaden =?= thermalization

  4. Mach-like cone Structure nucl-ex 0510055 nucl-ex 0507004 2.5<pTtrigger <4.0 GeV/c x 1.0<pTassoc<2.5 GeV/c PHENIX Preliminary

  5. Split parameter D PHENIX QM05

  6. Possible interpretations of mach-like cone structure Wake Effect or “sonic boom” Θemission= arccos (cs/c) nucl-th/0406018 Stöecker hep-ph/0411315 Casalderrey-Solana,Shuryak,Teaney nucl-th/0503028A. K. Chaudhuri hep-ph/0503158 Muller,Ruppert Cherenkov gluon radiation Θemission= arccos (1/n(p)) PRL 96, 172302 (2006) Koch, Majumder, X.-N. Wang Correlation of Jet with flowing medium hep-ph/0411341 Armesto,Salgado,Wiedemann

  7. AMPT model a multi-phase transport model (2) Melting AMPT Model (1) Default AMPT Model

  8. Mix-event Technique • (1) Get raw  correlation signal in same event. • (2)Get respective background by mixing events in same centrality. • (3)Get  correlation by removing background with ZYAM method. Background Subtracted signal

  9.  correlations from AMPT (3<pTtrigger<6GeV/c ,0.15<pTassoc<3GeV/c) (1) ▲melting version after hadronic rescattering (2) ●melting version before hadronic rescattering (3)◆ default version after hadronic rescattering (4)★default version before hadronic rescattering (5) ■ Star Data 0-5% (4-6)*(0.15-4)GeV/c factor=1.58 Au+Au 200GeV (0-10%)

  10. Jet remnants’ characters in AMPT Au+Au 200GeV Melting AMPT model

  11. Mach-like cone Structure in AMPT model  correlations in Au+Au 200GeV (2.5<pTtrigger<4GeV/c ,1<pTassoc<2.5GeV/c) D

  12. Mid-rapidity trig. asso. Forward-rapidity Correlations between forward- and mid-rapidity in d+Au collisions STAR Preliminary See Fuqiang’s talk

  13. background subtracted 3-particle correlation signal Three-particle correlations in AMPT mix-event technique (2.5<pTtrigger<4GeV/c ,1<pTassoc<2.5GeV/c)

  14. Three-particle correlation centrality dependence 3-particle correlation density definition:

  15. Parton cascade effect on 2- and 3- particle correlation (1)Hadronic rescattering mechanism also can produce 2- and 3-particle correlation, but it can not give big enough splitting parameters. (2) Parton cascade mechanism is essential for describing the amplitude of experimental mach-like structure.

  16. Conclusion • Di-hadron correlations can be produced by a multi-phase transport model(AMPT). • Mach-like structure is born in the partonic process and further developed in hadronic rescattering process. • hadronic rescattering mechanism can produce di-hadron correlation, but it can not give big enough splitting parameters. • Cone , deflected and center 3-particle correlations all exist in the central Au+Au collisions, however center 3-particle correlation become more dominant with the decreasing of Npart .

  17. Thanks for your attentions!

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