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汤思宇. 基于多相输运模型研究质子-铅核碰撞中椭圆流的组分夸克标度性[J]. 原子核物理评论, 2024, 41(1): 530-535. DOI: 10.11804/NuclPhysRev.41.2023CNPC19
引用本文: 汤思宇. 基于多相输运模型研究质子-铅核碰撞中椭圆流的组分夸克标度性[J]. 原子核物理评论, 2024, 41(1): 530-535. DOI: 10.11804/NuclPhysRev.41.2023CNPC19
Siyu TANG. Study of the NCQ Scaling of Elliptic Flow in p–Pb Collisions with a Multiphase Transport Model[J]. Nuclear Physics Review, 2024, 41(1): 530-535. DOI: 10.11804/NuclPhysRev.41.2023CNPC19
Citation: Siyu TANG. Study of the NCQ Scaling of Elliptic Flow in p–Pb Collisions with a Multiphase Transport Model[J]. Nuclear Physics Review, 2024, 41(1): 530-535. DOI: 10.11804/NuclPhysRev.41.2023CNPC19

基于多相输运模型研究质子-铅核碰撞中椭圆流的组分夸克标度性

Study of the NCQ Scaling of Elliptic Flow in p–Pb Collisions with a Multiphase Transport Model

  • 摘要: 高能重离子碰撞中末态鉴别粒子的椭圆流组分夸克标度现象被认为是展现部分子各向异性自由度的重要信号之一。本研究利用多相输运(AMPT)模型系统地研究了质心能量为5.02 TeV的质子-铅核碰撞中末态轻味强子的椭圆流 \upsilon_2^及其组分夸克标度行为。基于最新的小系统流分析方法,AMPT模型的计算结果很好地描述了轻味介子的 \upsilon_2^,但与重子的测量结果略有偏离。研究结果显示,耦合了部分子级联与夸克重组合机制的AMPT模型能产生显著的组分夸克标度现象,该现象也同时依赖于非流效应与强子再散射过程。这些研究结果将为小系统碰撞中末态粒子集体行为的起源问题提供进一步的解释。

     

    Abstract: The number of constituent quark(NCQ) scaling of elliptic flow in heavy-ion collisions is one of the important signals of parton anisotropic degrees of freedom. In this work, we systematically study the \upsilon_2^ of light flavor hadrons as well as its NCQ scaling in p−Pb collisions at 5.02 TeV, with a multiphase transport(AMPT) model. Based on the advanced flow extraction method, the AMPT model calculations provide a good description of the measured transverse momentum(p_\mathrmT^)-differential \upsilon_2^ of mesons but exhibit a slight deviation of the baryon \upsilon_2^. We find that the NCQ scaling is mainly driven by the combination of parton cascade and quark recombination, and also affected by the nonflow contribution and hardronic rescattering. This study provides new insights into understanding the origin of collective-like behaviors in small collision system.

     

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