标题： 重夸克介子在LHC能量下的能量损失和关联的系统尺寸依赖性 显示英文标题

标题： System size dependence of energy loss and correlations of heavy mesons at LHC energies

摘要： 我们研究在质心系能量为$\sqrt{s_{\rm NN}}=5.02$TeV 时重夸克（HQ）可观测量的系统尺寸依赖性，以探讨它是否能对涉及的物理过程提供进一步约束：重夸克在夸克胶子等离子体（QGP）中的能量损失、强子化和强子再散射。 我们使用 EPOS4HQ 方法研究 p-p 和 0-10% 中心 O-O、Ar-Ar、Kr-Kr 和 Pb-Pb 反应，并详细研究重夸克从产生到作为强子的一部分被探测时的动量变化，以及低$p_T$时重重子产生的增强。 此外，我们还研究了重夸克$Q$与重反夸克$\bar Q$之间的方位角关联的起源及其系统尺寸依赖性，以及如何绕过由于组合背景导致关联被冲淡的问题。 我们得出结论，对动量损失的系统研究可以将通过 QGP 的动量损失与由于强子化引起的动量变化分开，而$Q\bar Q$关联有助于深入了解重夸克产生的不同 pQCD 过程。 显示英文摘要

摘要： We study the system size dependence of heavy quark (HQ) observables at a center of mass energy of $\sqrt{s_{\rm NN}}=5.02$ TeV to explore whether it can provide further constraints on the physical processes which are involved: energy loss of HQs in the quark gluon plasma (QGP), hadronization and hadronic rescattering. We use the EPOS4HQ approach to study p-p and 0-10\% central O-O, Ar-Ar, Kr-Kr and Pb-Pb reactions and investigate in detail the momentum change of heavy quarks from creation until their detection as part of a hadron as well as the enhancement of heavy baryon production at low $p_T$. We investigate furthermore the origin and the system size dependence of the azimuthal correlations between the heavy quark $Q$ and the heavy antiquark $\bar Q$ and how one can bypass the problem that correlations are washed out due to the combinatorial background. We conclude that a systematic study of the system size dependence of the momentum loss allows to separate the momentum loss due to the passage through the QGP from the momentum change due to hadronization and the $Q\bar Q$ correlations allow to gain inside into the different pQCD processes in which the heavy quarks are created.