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Two-particle angular correlations in heavy ion collisions from a multiphase transport model

机译:来自多相输送模型的重离子碰撞中的双粒子角相关性

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We extend our earlier study on two-particle angular correlations in pp collisions at low transverse momentum (p(T)) to p-Pb, Pb-Pb, and Au-Au collisions at BNL Relativistic Heavy Ion Collider and CERN Large Hadron Collider energies. We mainly use the string melting version of a multiphase transport model with improved quark coalescence for this study. We start from the analysis of pi(+/-), K-+/-, and p((p) over bar) p(T) and rapidity distributions at different centralities. We then focus on two-particle angular correlations in p-Pb collisions at root s(NN) = 5.02 TeV and Pb-Pb collisions at root s(NN) = 2.76 TeV. For p-Pb collisions, a near side depression in the angular correlation is observed for low p(T) proton pairs and Lambda pairs but not for pion pairs or kaon pairs, similar to our earlier finding for pp collisions at root s = 7 TeV. This is also the case for very low multiplicity Pb-Pb and Au-Au collisions. We also find that parton interactions and the improved quark coalescence are mainly responsible for the depression feature in baryon pair angular correlations. However, no such baryon-baryon anticorrelations are observed in Pb-Pb and Au-Au collisions at higher multiplicities. Therefore our results suggest that low p(T) baryon-baryon angular anticorrelations have a strong multiplicity dependence.
机译:我们在BNL相对论重离子撞机和CERN大型HADRON碰撞器能量下对PP碰撞中的PP碰撞中PP碰撞中的双粒子角度相关性(P(t))和互联碰撞中的碰撞延长了对PP碰撞中的两个粒子角相关性的研究。我们主要使用多相传输模型的弦熔断版,并为这项研究改进夸克聚结。我们从分析PI(+/-),K - + / - 和P((P)上方的杆)P(t)和不同集中的快速分布。然后,我们专注于根S(nn)= 5.02 tev和pb-pb碰撞的p-pb碰撞中的两个粒子角相关性,并在根S(nn)= 2.76 tev。对于P-PB碰撞,对于低p(t)质子对和Lambda对,但不适用于PION对或KAON对,观察到角度相关的近侧凹陷,类似于我们之前寻找Root S = 7 Tev的PP碰撞。这也是非常低的多样性PB-PB和AU-AU碰撞的情况。我们还发现Parton相互作用和改进的夸克聚结主要负责Baryon对角相关中的凹陷特征。然而,在PB-Pb和较高的多个碰撞中没有观察到这种Baryon-Baryon逆相关性。因此,我们的结果表明,低P(T)Baryon-Baryon角触摸吻合依赖性具有强大的多重性。

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