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Charm quarks are more hydrodynamic than light quarks in final-state elliptic flow

机译:Charm夸克比最终状态椭圆流中的光夸克更流体动力学

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摘要

We study the charm quark elliptic flow (v(2)) in heavy ion as well as small system collisions by tracking the evolution history of quarks of different flavors within a multiphase transport model. The charm quark v(2) is studied as a function of the number of collisions the charm quark suffers with other quarks and then compared to the v(2) of lighter quarks. We find that the common escape mechanism is at work for both the charm and light quark v(2) . However, contrary to the naive expectation, the hydrodynamics-type flow is found to contribute more to the final state charm v(2) than the light quark v(2). This could be explained by the smaller average deflection angle the heavier charm quark undergoes in each collision, so that heavy quarks need more scatterings to accumulate a significant v(2), while lighter quarks can more easily change directions with scatterings with their v(2) coming more from the escape mechanism. Our finding thus suggests that the charm v(2 )is a better probe for studying the hydrodynamic properties of the quark-gluon plasma.
机译:通过跟踪多相输送模型内不同口味的夸克的演化历史,研究了重离子的魅力夸克椭圆形流(V(2))以及小型系统碰撞。研究了Charm Quark V(2)作为碰撞次数的函数,魅力夸克与其他夸克遭受的次数,然后与较轻夸克的V(2)相比。我们发现共同的逃生机制是为魅力和光夸克v(2)工作的工作。然而,与Naive期望相反,发现流体动力学型流量比光夸克v(2)更贡献到最终状态魅力V(2)。这可以通过较小的平均偏转角来解释,较重的魅力夸克在每次碰撞中经历,因此重型夸克需要更多的散射来累积显着的V(2),而打火机夸克可以更容易地改变与v的散射方向(2 )从逃生机制即将来临。因此,我们的发现表明Charm V(2)是研究夸克 - 胶质等离子体的流体动力学性能的更好探针。

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  • 来源
    《Physical review, C》 |2019年第4期|共6页
  • 作者单位

    Wuhan Univ Sci &

    Technol Hubei Prov Key Lab Syst Sci Met Proc Wuhan 430081 Hubei Peoples R China;

    Cent China Normal Univ Key Lab Quarks &

    Lepton Phys MOE Wuhan 430079 Hubei Peoples R China;

    Huzhou Univ Sch Sci Huzhou 313000 Zhejiang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
  • 关键词

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