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首页> 外文期刊>Physical review, C >Multiparticle azimuthal cumulants in p plus Pb collisions from a multiphase transport model
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Multiparticle azimuthal cumulants in p plus Pb collisions from a multiphase transport model

机译：多粒子方位角累积量在P Plus PB来自多相输送模型的碰撞

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摘要

A new subevent cumulant method was recently developed, which can significantly reduce the nonflow contributions in long-range correlations for small systems compared to the standard cumulant method. In this work, we study multiparticle cumulants in p + Pb collisions at root s(NN) = 5.02 TeV with a multiphase transport model (AMPT), including two- and four-particle cumulants (c(2){2} and c(2){4}) and symmetric cumulants [SC(2, 3) and SC(2, 4)]. Our numerical results show that upsilon(2){2} is consistent with the experimental data, while the magnitude of c(2){4} is smaller than the experimental data, which may indicate that either the collectivity is underestimated or some dynamical fluctuations are absent in the AMPT model. For the symmetric cumulants, we find that the results from the standard cumulant method are consistent with the experimental data, but those from the subevent cumulant method show different behaviors. The results indicate that the measurements from the standard cumulant method are contaminated by nonflow effects, especially when the number of produced particles is small. The subevent cumulant method is a better tool to explore the real collectivity in small systems.
机译：最近开发了一种新的子宫累积方法，与标准累积方法相比，可以显着降低小型系统的远程相关性的非流贡献。在这项工作中，通过多相传输模型（AMPT），在根S（NN）= 5.02 TEV的P + Pb碰撞中研究多粒累积物，包括两种和四粒子累积剂（C（2）{2}和C（ 2）{4}）和对称累积剂[SC（2,3）和SC（2,4）]。我们的数值结果表明，Upsilon（2）{2}与实验数据一致，而C（2）{4}的幅度小于实验数据，这可能表明该系数低估或一些动态波动在AMPT模型中缺席。对于对称累积剂，我们发现标准累积方法的结果与实验数据一致，但来自子宫累积方法的那些表现出不同的行为。结果表明，标准累积方法的测量由非流效应污染，尤其是当产生的颗粒的数量小时。子宫累积方法是探索小型系统中真正集体的更好工具。

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