Trace initial interaction from final state observable in relativistic heavy ion collisions

  • In order to trace azimuthal angle dependence of the initial interaction in ultra-relativistic heavy ion collision, two azimuthal multiplicity-correlation patterns
    — neighboring and fixed-to-arbitrary angular-bin correlation patterns — are suggested. From the simulation of Au + Au collisions at √SNN=200 GeV by using the Monte Carlo models RQMD with hadron re-scattering and AMPT with and without string melting, we observe that the correlation patterns change
    gradually from out-of-plane preferential one to in-plane preferential one when the centrality of collision shifts from the central collision to peripheral collision, meanwhile the anisotropic collective flow v2 keeps positive in all cases. This regularity is found to be collision energy independent. The physics behind the
    two opposite trends of correlation patterns, in particular, the presence of out-of-plane correlation patterns at RHIC energy, are discussed.

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  • [1] . Adcox K et al. (PHENIX Collaboration). Nucl. Phys. A,2005, 757: 184-283; John Adams et al. (STAR Collaboration).Nucl. Phys. A, 2005, 757: 102-183; Back B Bet al. (PHOBOS Collaboration). Nucl. Phys. A, 2005, 757:28-101; Arsene I et al. (BRAHMS Collaboration). Nucl.Phys. A, 2005, 757: 1-272. Miklos Gyulassy. Larry McLerran. Nucl. Phys. A, 2005,750: 30-633. Sorge H. Phys. Lett. B, 1997, 402: 251; Phys. Rev. Lett.,1999, 82: 2048; Molnar D, Gyulassy M. Nucl. Phys. A,2002, 697: 4954. Heinz U. J. Phys. G, 2005, 31: s717-s724; Alver B et al.(PHOBOS). Phys. Rev. Lett., 2007, 98: 242302; Adare Aet al. (PHENIX). Phys. Rev. Lett., 2007, 98: 162301; HiranoT, Isse M, Nara Y, Ohnishi A, Yoshino K. Phys. Rev.C, 2005, 72: 04119015. Sorge H. Phys. Lett. B, 1997, 402: 2516. Adcox K et al. (PHENIX Coll.). Phys. Rev. Lett., 2002,89: 2123017. Bozek P, Ploszajczak M, Botet R. Phys. Reports, 1995,252: 101; de Wolf E A, Dremin I M, Kittle W. Phys. Reports,1995, 297: 18. WU Yuan-Fang, LIU Lian-Shou, WANG Ying-Dan, BAIYu-Ting, LIAO Hong-Bo. Phys. Rev. E, 2005, 71: 0171039. Sorge H. Phys. Rev. C, 1995, 52: 329110. LIN Zi-Wei, KO Che-Ming, LI Bao-An, ZHANG Bin, SubrataPal. Phys. Rev. C, 2005, 72: 06490111. John Adams et al. (STAR Collaboration). Phys. Rev. Lett.,2004, 93: 252301; John Adams et al. (STAR Collaboration).Phys. Rev. Lett., 2005, 95: 12230112. WANG Mei-Juan, WU Yuan-Fang. Rapidity and Azimuthal Correlation Patterns in Nucleon-Nucleon and RelativisticHeavy Ion Collisions at 200 GeV. In: Proc. of XXIInter. Workshop on Correlation and fuctuation, Nov. 2006,Hangzhou, China. Inter. Jour. of Modern Phys. E, 2007,16: 3379-338513. Brill D et al. Z. Phys. A, 1996, 355: 61; Alard J P etal. Out-of-Plane Emission of Nuclear Matter in Au+Au,Xe+CsI and Ni+Ni Collisions at 250 AMeV. GSI Report,199614. Stocker H et al. Phys. Rev., C, 1982, 25: 1873; Gutbrod HH et al. Phys. Lett. B, 1989, 216: 26715. Jean-Yves Ollitrault. Nucl. Phys. A, 1998, 638: 195-206;Danielewicz P. Nucl. Phys. A, 2001, 685: 368-38316. LIU H, Panitkin S, XU N. Phys. Rev. C, 1999, 59: 34817. Alver B et al. arXiv:0711.3724
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WANG Mei-Juan, LIU Lian-Shou and WU Yuan-Fang. Trace initial interaction from final state observable in relativistic heavy ion collisions[J]. Chinese Physics C, 2009, 33(1): 36-41. doi: 10.1088/1674-1137/33/1/008
WANG Mei-Juan, LIU Lian-Shou and WU Yuan-Fang. Trace initial interaction from final state observable in relativistic heavy ion collisions[J]. Chinese Physics C, 2009, 33(1): 36-41.  doi: 10.1088/1674-1137/33/1/008 shu
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Received: 2008-04-03
Revised: 2008-05-15
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Trace initial interaction from final state observable in relativistic heavy ion collisions

    Corresponding author: WANG Mei-Juan,

Abstract: 

In order to trace azimuthal angle dependence of the initial interaction in ultra-relativistic heavy ion collision, two azimuthal multiplicity-correlation patterns
— neighboring and fixed-to-arbitrary angular-bin correlation patterns — are suggested. From the simulation of Au + Au collisions at √SNN=200 GeV by using the Monte Carlo models RQMD with hadron re-scattering and AMPT with and without string melting, we observe that the correlation patterns change
gradually from out-of-plane preferential one to in-plane preferential one when the centrality of collision shifts from the central collision to peripheral collision, meanwhile the anisotropic collective flow v2 keeps positive in all cases. This regularity is found to be collision energy independent. The physics behind the
two opposite trends of correlation patterns, in particular, the presence of out-of-plane correlation patterns at RHIC energy, are discussed.

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