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Background introduction Model introduction Analysis method Results and discussions Conclusions

Two- and Three-particle Correlations in a Partonic 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, J. X. Zuo.

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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 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, J. X. Zuo. • Background introduction • Model introduction • Analysis method • Results and discussions • Conclusions (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. Mach-like Structures (3)

  4. Possible interpretations of Mach-like structures Mach cone shock waves 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 Gluon radiations (Cherenkov or Bremsstrahlung) 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 (4)

  5. 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 (5)

  6. AMPT model Background Subtracted signal Mixing-event Technique • (1) Get raw  correlation signal in same event. • (2)Get corresponding background by mixing events in same centrality. • (3)Get  correlation by removing background with ZYAM method (PHENIX CollaborationPRL 97, 052301 (2006)). (6)

  7.  correlations from AMPT (3<pTtrigger<6GeV/c ,0.15<pTassoc<3GeV/c) ▲ melting version with hadronic rescattering (10mb) ●melting version without hadronic rescattering (10mb) ■ STAR data 0-5% (4-6)x(0.15-4)GeV/c • Mach-like structure is born in strong parton cascade process, and furthermore developed in hadronic rescattering process. • The problem of excessive correlation magnitude. PLB 641, 362 (2006) G. L. Ma et al. PLB 641, 362 (2006) G. L. Ma et al. (7)

  8.  correlations from AMPT (3<pTtrigger<6GeV/c ,0.15<pTassoc<3GeV/c) • No splitting is seen on away side under the soft pT cut in default version (only with hadronic resacttering )! ■ STAR data 0-5% (4-6)x(0.15-4)GeV/c ◆default version with hadronic rescattering ★default version without hadronic rescattering PLB 641, 362 (2006) G. L. Ma et al. (8)

  9. near near • deflected-jets • Mach cone shock waves: Medium Medium away away Δ2 Δ2 π π 0 0 π 0 π Δ1 Δ1 0 More information from 3-particle correlation --- deflected jetsor Mach cone shock waves? (9)

  10. background subtracted 3-particle correlation signal (2) (4) (1) (5) (3) Three-particle correlations in AMPT mix-event technique (2.5<pTtrigger<4GeV/c ,1<pTassoc<2.5GeV/c) (10) nucl-th/0608050, G. L. Ma et al.

  11. ■ PHENIX data (nucl-ex/0510019 ) □parton cascade + hadronic rescattering ○ hadronic rescattering Parton cascade effect on 2- and 3- particle correlations 1) Hadronic rescattering mechanism alone can not give big enough splitting parameters and correlation areas. 2) Parton cascade mechanism is essential for describing the splitting amplitude of experimental Mach-like structure. 3) Large energy loss in dense partonic medium. parton cascade + hadronic rescattering hadronic rescattering alone (11)

  12. Au+Au 200GeV (0-10%) Partonic Mach-like Shock Waves ? nucl-th/0610088, G. L. Ma et al. (12)

  13. pT dependences of Mach-like structures pT-dependent Mach-like shock waves See S. Zhang’s poster, for the detail of pT andη dependences of Mach-like structures (49, section 2) . (13)

  14. Conclusions • Partonic Mach-like shock waves are born in the strong dynamical parton cascade and further developed in hadronic rescattering process. The problem of excessive correlation magnitude is still not solved in current AMPT model. • Hadronic rescattering mechanism alone can produce similar correlations, but it can not give big enough splitting parameters and correlation areas. • The partonic Mach-like shock waves are centrality-dependent ,pT-dependent within the AMPT model. (14)

  15. Thanks for your attentions! (15)

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