探索PYTHIA8中的弦推模型在$pp$碰撞中的集体行为
Exploring the string shoving model in PYTHIA8 for collective behaviors in $pp$ collisions
摘要：
两粒子关联被用来研究相对论性重离子碰撞中产生的夸克-胶子等离子体（QGP）的性质，产生粒子间的长程关联被认为是强相互作用QGP存在的有力证据。引人注目的是，在$pp$和$p$ + $A$这样的小碰撞系统中，在很宽的碰撞能量范围内也观察到了明显的长程相关。在通量管之间引入一种称为弦推的排斥力的模型可以定性地描述高多重数$pp$碰撞中的长程近侧关联。该模型在PYTHIA蒙特卡罗事件发生器中实现，使我们能够进行详细的研究。在这项工作中，一个完整的数据分析，以计算相关的产额和流量系数进行PYTHIA事件，并与实验结果进行比较。我们发现，串推模型高估了长期的近侧相关性，特别是在低多重性事件。我们还介绍了一种方法来减去这种高估的相关性在低的多重性有一个更相关的比较数据。
英文摘要：
Two-particle correlations have been used to study property of a produced medium called Quark-Gluon Plasma (QGP) in relativistic heavy-ion collisions, and a long-range correlation among produced particles has been considered as a strong evidence of strongly interacting QGP. Strikingly, clear long-range correlations have been also observed in small collision systems like $pp$ and $p$+$A$ at a wide range of collision energies. A model introducing a repulsive force between flux tubes called string shoving can qualitatively describe the long-range near-side correlations in high multiplicity $pp$ collisions. This model implemented in the PYTHIA Monte Carlo event generator allows us to perform detailed study. In this work, a full data analysis to calculate associated yields and flow coefficients is performed with PYTHIA events, and the results are compared with experimental results. We find that the string shoving model overestimates long-range near-side correlations particularly in low multiplicity events. We also introduce a method to subtract such overestimated correlations in low multiplicity to have a more relevant comparison with the data.
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