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arXiv 2112.03397nucl-thhep-phnucl-ex
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重离子碰撞中的高阶横动量涨落

Higher-order transverse momentum fluctuations in heavy-ion collisions

Somadutta Bhatta, Chunjian Zhang, Jiangyong Jia

摘要:

在相对论性重离子碰撞中,事件平均横向动量起伏对初始态的重叠面积和能量密度起伏敏感。我们提出了一个框架来计算$p_{\mathrm{T}}$波动高达$4^{\mathrm{th}}$阶使用标准和子事件的方法,这是使用HIJING模型进行验证。我们观察到一个幂律依赖的累积量的所有订单作为带电粒子多重性的函数$N_{\mathrm{ch}}$,符合一个简单的独立源图片。在$pp$碰撞的波动被观察到大于$p+$铅,铅+铅和铅+铅碰撞在相同的$N_{\mathrm{ch}}$由于在贡献源的数量的偏差。与基于标准方法的计算相比,子事件方法大大抑制了短程相关。这项研究提供了一个基线的横向动量起伏没有存在的最终状态的影响。

英文摘要:

In relativistic heavy-ion collisions, the event-by-event mean transverse momentum fluctuations are sensitive to overlap area and energy density fluctuations in initial state. We present a framework to calculate $p_{\mathrm{T}}$ fluctuations up to $4^{\mathrm{th}}$-order using standard and subevent methods, which is validated using the HIJING model. We observe a power-law dependence for cumulants of all orders as a function of charged particle multiplicity $N_{\mathrm{ch}}$, consistent with a simple independent source picture. The fluctuation in $pp$ collisions is observed to be larger than for $p+$Pb, Pb+Pb and Xe+Xe collisions at the same $N_{\mathrm{ch}}$ due to bias in number of contributing sources. The short-range correlations are greatly suppressed in subevent method in comparison to calculations based on the standard method. This study provides a baseline for transverse momentum fluctuations without the presence of final state effects.

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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