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Toward the determination of heavy-quark transport coefficients in quark-gluon plasma

机译：朝向普克甘龙等离子体中重型夸克传输系数的测定

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摘要

Several transport models have been employed in recent years to analyze heavy-flavor meson spectra in high-energy heavy-ion collisions. Heavy-quark transport coefficients extracted from these models with their default parameters vary, however, by up to a factor of 5 at high momenta. To investigate the origin of this large theoretical uncertainty, a systematic comparison of heavy-quark transport coefficients is carried out between various transport models. Within a common scheme devised for the nuclear modification factor of charm quarks in a brick medium of a quark-gluon plasma, the systematic uncertainty of the extracted drag coefficient among these models is shown to be reduced to a factor of 2, which can be viewed as the smallest intrinsic systematical error band achievable at present time. This indicates the importance of a realistic hydrodynamic evolution constrained by bulk hadron spectra and of heavy-quark hadronization for understanding the final heavy-flavor hadron spectra and extracting heavy-quark drag coefficient. The transverse transport coefficient is less constrained due to the influence of the underlying mechanism for heavy-quark medium interaction. Additional constraints on transport models such as energy loss fluctuation and transverse-momentum broadening can further reduce theoretical uncertainties in the extracted transport coefficients.
机译：近年来，几个运输模型已经采用了在高能量重离子碰撞中分析重型味道梅森光谱。然而，从这些模型提取的重型夸克传输系数随着其默认参数而变化，高动度下降5倍。为了研究这种大型理论不确定性的来源，在各种运输模型之间进行重型夸克传输系数的系统比较。在夸克 - 胶质等离子体的砖介质中设计用于核改性因子的共同方案中，这些模型中提取的阻力系数的系统不确定性被认为减少到2系数，这可以被观察作为当前可实现的最小内在系统错误乐队。这表明由散装强子谱和重型夸克的重大夸久化的逼真的流体动力学演变的重要性，以了解最终重型强烈的强子谱并提取重夸克拖曳系数。由于潜在机构对重型夸克介质相互作用的影响，横向传输系数不太约束。在诸如能量损失波动和横向动量扩展的运输模型上的附加限制可以进一步降低提取的传输系数中的理论不确定性。

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  • 来源
    《Physical review, C》 |2019年第5期|共18页
  • 作者

    Cao Shanshan; Coci Gabriele; Das Santosh Kumar; Ke Weiyao; Liu Shuai Y. F.; Plumari Salvatore; Song Taesoo; Xu Yingru; Aichelin Jorg; Bass Steffen; Bratkovskaya Elena; Dong Xin; Gossiaux Pol Bernard; Greco Vincenzo; He Min; Nahrgane Marlene; Rapp Ralf; Scardina Francesco; Wang Xin-Nian;

  • 作者单位

    Wayne State Univ Dept Phys &

    Astron Detroit MI 48201 USA;

    Univ Catania Dept Phys &

    Astron Via Santa Sofia 64 I-95125 Catania Italy;

    Univ Catania Dept Phys &

    Astron Via Santa Sofia 64 I-95125 Catania Italy;

    Duke Univ Dept Phys Durham NC 27708 USA;

    Texas A&

    M Univ Cyclotron Inst College Stn TX 77843 USA;

    Univ Catania Dept Phys &

    Astron Via Santa Sofia 64 I-95125 Catania Italy;

    Univ Giessen Inst Theoret Phys Giessen Germany;

    Duke Univ Dept Phys Durham NC 27708 USA;

    Univ Nantes SUBATECH IMT Atlantique CNRS IN2P3 Nantes France;

    Duke Univ Dept Phys Durham NC 27708 USA;

    Goethe Univ Frankfurt Inst Theoret Phys Frankfurt Germany;

    Lawrence Berkeley Natl Lab Nucl Sci Div Berkeley CA 94740 USA;

    Univ Nantes SUBATECH IMT Atlantique CNRS IN2P3 Nantes France;

    Univ Catania Dept Phys &

    Astron Via Santa Sofia 64 I-95125 Catania Italy;

    Nanjing Univ Sci &

    Technol Dept Appl Phys Nanjing 210094 Jiangsu Peoples R China;

    Univ Nantes SUBATECH IMT Atlantique CNRS IN2P3 Nantes France;

    Texas A&

    M Univ Cyclotron Inst College Stn TX 77843 USA;

    Univ Catania Dept Phys &

    Astron Via Santa Sofia 64 I-95125 Catania Italy;

    Lawrence Berkeley Natl Lab Nucl Sci Div Berkeley CA 94740 USA;

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  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
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