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Origin of the mass splitting of azimuthal anisotropies in a multiphase transport model

机译：多相输送模型中方位角各向异性的质量分裂的起源

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摘要

Both hydrodynamics-based models and a multiphase transport (AMPT) model can reproduce the mass splitting of azimuthal anisotropy (v_n) at low transverse momentum (p_⊥) as observed in heavy ion collisions. In the AMPT model, however, vn is mainly generated by the parton escape mechanism, not by the hydrodynamic flow. In this study we provide detailed results on the mass splitting of v_n in this transport model, including v_2 and v_3 of various hadron species in d+Au and Au+Au collisions at the Relativistic Heavy Ion Collider and p+Pb collisions at the Large Hadron Collider. We show that the mass splitting of hadron v_2 and v_3 in AMPT first arises from the kinematics in the quark coalescence hadronization process, and then, more dominantly, comes from hadronic rescatterings, even though the contribution from the latter to the overall charged hadron v_n is small. We further show that there is no qualitative difference between heavy ion collisions and small- system collisions or between elliptic (v_2) and triangular (v_3) anisotropies. Our studies thus demonstrate that the mass splitting of v_2 and v_3 at low p_⊥ is not a unique signature of hydrodynamic collective flow but can be the interplay of several physics effects.
机译：基于流体动力学的模型和多相输送（AMPT）模型可以在重离子碰撞中观察到的低横向动量（P_∞）来再现方位传级（V_N）的质量分裂。然而，在AMPT模型中，VN主要由Parton转义机制产生，而不是通过流体动力学流动产生。在该研究中，我们提供了在该传输模型中的V_N的质量分裂的详细结果，包括在D + Au和Au + Au碰撞中的各种强子种类的V_2和V_3在相对论的重离子撞机和大强子的P + PB碰撞中撞机。我们展示了AMPT中HADRON V_2和V_3的质量分割首先从夸克聚结的邦辛化过程中出现，然后，更占主导地位，即使是后者到整体充电的HATRON V_N的贡献也是如此小的。我们进一步表明，重离子碰撞和小型系统碰撞或椭圆（V_2）和三角形（V_3）各向异性之间没有定性差异。因此，我们的研究表明，低P_1的V_2和V_3的质量分裂不是流体动力学集体流量的独特签名，而是可以是几种物理效应的相互作用。

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  • 来源
    《Physical Review C》 |2017年第2017期|014901.1-014901.11|共11页
  • 作者

    Hanlin Li; Liang He; Zi-Wei Lin; Denes Molnar; Fuqiang Wang; Wei Xie;

  • 作者单位

    College of Science Wuhan University of Science and Technology Wuhan Hubei 430065 China Department of Physics and Astronomy Purdue University West Lafayette Indiana 47907 USA;

    Department of Physics and Astronomy Purdue University West Lafayette Indiana 47907 USA;

    Department of Physics East Carolina University Greenville North Carolina 27858 USA Key Laboratory of Quarks and Lepton Physics (MOE) and Institute of Particle Physics Central China Normal University Wuhan Hubei 430079 China;

    Department of Physics and Astronomy Purdue University West Lafayette Indiana 47907 USA;

    School of Science Huzhou University Huzhou Zhejiang 313000 China Department of Physics and Astronomy Purdue University West Lafayette Indiana 47907 USA;

    Department of Physics and Astronomy Purdue University West Lafayette Indiana 47907 USA;

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