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Background introduction Model introduction Analysis method Results and discussions Conclusions

Two- and Three-particle Correlations in a Partonic Transport Model. Y.G. Ma, G.L. Ma, S. Zhang, X. Z. Cai, H. Z. Huang et al. Shanghai Institute of Applied Physics, CAS. Background introduction Model introduction Analysis method Results and discussions Conclusions

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Background introduction Model introduction Analysis method Results and discussions Conclusions

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  1. Two- and Three-particle Correlations in a Partonic Transport Model Y.G. Ma, G.L. Ma, S. Zhang, X. Z. Cai, H. Z. Huang et al. Shanghai Institute of Applied Physics, CAS • Background introduction • Model introduction • Analysis method • Results and discussions • Conclusions G.L. Ma, S. Zhang, YGM et al., Phys Lett B 641, 362 (2006) G.L.Ma, YGM, S. Zhang et al., arXiv:nucl-th/0608050, sub to PLB G.L.Ma, S. Zhang, YGM et al., arXiv:nucl-th/0610088, sub to APS (1

  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 (2

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

  4. PHENIX PRL 97, 052301 (2006) NPA 774, 581 (2006) Mach-like Structures (4

  5. Possible interpretations of Mach-like structures Wake Effect or “sonic boom” Θemission= arccos (cs/c) NPA 750, 121 (2005) Stöecker hep-ph/0411315, hep-ph/0602183 Casalderrey-Solana PLB 618, 123 (2005) J. Ruppert PRC 73, 011901(R) (2006) T. Renk PRL 97, 062301(2006) A. K. Chaudhuri Cherenkov gluon radiation Θemission= arccos (1/n(p)) PRL 96, 172302 (2006) Koch, Majumder, X.-N. Wang PLB 630, 78 (2005) I. Vitev NPA 767, 233 (2006) I.M. Dremin Correlation of Jet with flowing medium PRC 72, 064910 (2005) Armesto (5

  6. AMPT model a multi-phase transport model (by C. M. Ko and Z. W. Lin et al.) (2) Melting AMPT Model (1) Default AMPT Model (6

  7. Mixing-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 (7

  8.  correlations from AMPT (3<pTtrigger<6GeV/c ,0.15<pTassoc<3GeV/c) Au+Au 200GeV (0-10%) (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 (8

  9. D Mach-like Structures in AMPT model  correlations in Au+Au 200GeV (2.5<pTtrigger<4GeV/c ,1<pTassoc<2.5GeV/c) (9

  10. near near 3-4 GeV/c 1-2 GeV/c near assoc trigger Medium soft bkgd assoc Medium Medium away away mach cone away di-jets deflected jets Is there conical flow? Df2 3-particle correlation Df1 hard-soft-corr + soft-bkgd. Df2 flow modulated background: soft-soft-corr in underlying event. Df1

  11. background subtracted 3-particle correlation signal Three-particle correlations in AMPT mix-event technique (2.5<pTtrigger<4GeV/c ,1<pTassoc<2.5GeV/c) (10

  12. The Npart dependences of three-particle correlations 3-particle correlation density definition: (11

  13. No Mach-cone behavior! What happens for p+p?

  14. Mid-rapidity trig. asso. Forward-rapidity Correlations between forward- and mid-rapidity in d+Au collisions STAR Preliminary

  15. Parton cascade effect on 2- and 3- particle correlations (1)Hadronic rescattering mechanism also can produce 2- and 3-particle correlations, but it can not give big enough splitting parameters. (2) Parton cascade mechanism is essential for describing the amplitude of experimental mach-like structure. (12

  16. Time Evolution of Mach-like Structures in AMPT model Lifetime parton cascade hadronic rescattering • At least a lifetime of partonic matter of 1.5 fm/c is needed for the birth of Mach-like structures for 10mb. (13

  17. Au+Au 200GeV (0-10%) Partonic Mach-Like Shock Waves ? (14

  18. (15 pT dependences of Mach-like structures pT-dependent Mach-like shock waves (15

  19. ? ? √ ? ? ? η dependences of Mach-like structures PHOBOS (16

  20. Conclusions and Outlook Conclusions: • Partonic Mach-like shock waves are born in the strong parton cascade and further developed in hadronic rescattering process. • Hadronic rescattering mechanism can produce similar correlation, but it can not give big enough splitting parameters and correlation areas. • The partonic shock waves are centrality-dependent ,pT-dependent and η-dependent. Outlook: • Special trigger particles and associated particles • System-size dependence including d+Au and p+p • Δη and ridge- correlations (17

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