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arXiv 1407.7306hep-phnucl-th
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在RHIC和LHC p+A中方位谐波的初态韧致辐射与终态流体动力学源

Initial-State Bremsstrahlung versus Final-State Hydrodynamic Sources of Azimuthal Harmonics in p+A at RHIC and LHC

Miklos Gyulassy, Peter Levai, Ivan Vitev, Tamas S. Biro

摘要:

最近在RHIC/BNL的束流能量扫描(BES)和D+Au运行中获得的pT<2~GeV方位角相关数据,特别是$p+Pb$和LHC的$Pb+Pb$中方位角$v_n\{2m\}(p_T)$ "transeverse flow“谐波的惊人相似性,对这些数据的局部平衡”完美流体“解释的唯一性提出了挑战。我们报告的结果在QM 14的方位角谐波与初始状态的非阿贝尔“波干涉”的影响预测微扰QCD胶子韧致辐射和来源的彩色闪烁阵列(CSA)的彩色天线。CSA是自然确定与多个弹丸和目标束射流产生的非弹性p+A反应。我们发现一个显着的相似性之间的方位角谐波来源的初始状态CSA和预测的最终状态完美流体模型的高能量p+A反应。目前,哪种机制在$p+A$和$A+A$中占主导地位的问题仍然悬而未决。

英文摘要:

Recent pT<2~GeV azimuthal correlation data from the Beam Energy Scan (BES) and D+Au runs at RHIC/BNL and, especially, the surprising similarity of azimuthal $v_n\{2m\}(p_T)$ ``transeverse flow'' harmonics in $p+Pb$ and $Pb+Pb$ at LHC have challenged the uniqueness of local equilibrium ``perfect fluid'' interpretations of those data. We report results at QM14 on azimuthal harmonics associated with initial-state non-abelian ``wave interference'' effects predicted by perturbative QCD gluon bremsstrahlung and sourced by Color Scintillation Arrays (CSA) of color antennas. CSA are naturally identified with multiple projectile and target beam jets produced in inelastic p+A reactions. We find a remarkable similarity between azimuthal harmonics sourced by initial state CSA and those predicted with final state perfect fluid models of high energy p+A reactions. The question of which mechanism dominates in $p+A$ and $A+A$ remains open at this time.

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