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arXiv 1107.0130hep-ph
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在pQCD-based部分子输运模型中RHIC和LHC的喷流猝灭和椭圆流

Jet quenching and elliptic flow at RHIC and LHC within a pQCD-based partonic transport model

Oliver Fochler, Jan Uphoff, Zhe Xu, Carsten Greiner

摘要:

采用微扰QCD部分子输运模型BAMPS(Boltzmann Approach to Multi-Parton Scatterings),对RHIC和LHC能区的重离子碰撞进行了全动力学模拟,重点研究了喷注猝灭和椭圆流的同时发生.该模型具有非弹性的2 <->- 3过程的基础上的Gunion-Bertsch矩阵元素,最近已扩展到包括轻夸克的自由度,允许直接比较强子数据的核修改因子通过碎裂计划的高pT部分子。在RHIC能区中心Au+Au碰撞中,中性π介子的核修正因子与实验数据进行了比较。此外,首次给出了LHC上Pb+Pb碰撞中核修正因子和带电强子积分椭圆流的结果,并与最近的ALICE数据进行了比较。这些调查的补充,在LHC的基础上与介质的弹性相互作用的抑制D介子的研究。

英文摘要:

Fully dynamic simulations of heavy ion collisions at RHIC and at LHC energies within the perturbative QCD-based partonic transport model BAMPS (Boltzmann Approach to Multi-Parton Scatterings) are presented, focusing on the simultaneous investigation of jet quenching and elliptic flow. The model features inelastic 2 <-> 3 processes based on the Gunion-Bertsch matrix element and has recently been extended to include light quark degrees of freedom, allowing for direct comparison to hadronic data on the nuclear modification factor via a fragmentation scheme for high-pT partons. The nuclear modification factor of neutral pions in central Au+Au collisions at RHIC energy is compared to experimental data. Furthermore first results on the nuclear modification factor and the integrated elliptic flow of charged hadrons in Pb+Pb collisions at LHC are presented and compared to recent ALICE data. These investigations are complemented by a study on the suppression of D-mesons at LHC based on elastic interactions with the medium.

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