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arXiv 2112.01232nucl-thnucl-ex
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13 TeV上$p+p$碰撞多粒子累积量的输运模型研究

A transport model study of multiparticle cumulants in $p+p$ collisions at 13 TeV

Xin-Li Zhao, Zi-Wei Lin, Liang Zheng, Guo-Liang Ma

摘要:

流动的信号,包括在小碰撞系统中观察到的类似于那些在大型碰撞系统的脊结构,导致了在核碰撞集体性的发病问题。在这项研究中,我们使用弦熔化版本的多相输运(AMPT)模型与或不与亚核子几何质子研究多粒子累积量在$p+p$碰撞在13 TeV。模型的两个版本在高多重性下均产生负的$c_{2}\{4 \}$值。此外,$c_{2}\{4 \}$对部分子截面的依赖性是非单调的,其中仅部分子截面值的范围导致负的$c_{2} \{4 \}$。此外,考虑亚核子几何的AMPT模型更好地描述了$c_{2} \{4 \}$的多重数依赖性,说明了在小碰撞系统研究中考虑亚核子几何的重要性.

英文摘要:

Flow-like signals including the ridge structure observed in small collision systems that are similar to those in large collision systems have led to questions about the onset of collectivity in nuclear collisions. In this study, we use the string melting version of a multi-phase transport (AMPT) model with or without the sub-nucleon geometry for the proton to study multiparticle cumulants in $p+p$ collisions at 13 TeV. Both versions of the model produce negative $c_{2}\{4 \}$ values at high multiplicities. In addition, the dependence of $c_{2}\{4 \}$ on the parton cross section is non-monotonous, where only a range of parton cross section values leads to negative $c_{2} \{4 \}$. Furthermore, the AMPT model with sub-nucleon geometry better describes the multiplicity dependence of $c_{2} \{4 \}$, demonstrating the importance of incorporating the sub-nucleon geometry in studies of small collision systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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