论文标题
扰动QCD中小型系统碰撞中的核修饰因子，包括热效应
Nuclear Modification Factor in Small System Collisions within Perturbative QCD Including Thermal Effects
论文作者
论文摘要
在本文中，研究了已故的让·克莱操教授（Jean Cleymans）的记忆，核修饰因子$ r_ {xa} $在小型系统碰撞中进行了pion的产生，该phinix实验在rhic（相对性的重离子碰撞者）中测量。理论框架是横向动量$ k_t $ - fractorization形式主义，用于小动量分数（$ x $）的硬过程。基于在弛豫时间近似中Blast-Wave类型的现象学参数化研究，研究了在平衡下产生的集体膨胀和热效应的证据。讨论了对中心性和弹丸物种的依赖性，以cronin峰的行为以及$ r_ {xa} $的抑制在很大的横向动量下，$ p_t $。目前的分析也包括对光谱的软扇形敏感的产生的颗粒的多样性。
In this paper, dedicated to the memory of the late Prof. Jean Cleymans, the nuclear modification factors, $R_{xA}$, are investigated for pion production in small system collisions, measured by PHENIX experiment at RHIC (Relativistic Heavy Ion Collider). The theoretical framework is the transverse momentum $k_T$-factorization formalism for hard processes at small momentum fraction, $x$. Evidence for collective expansion and thermal effects for pions, produced at equilibrium, is studied based on phenomenological parametrization of blast-wave type in the relaxation time approximation. The dependencies on the centrality and on the projectile species are discussed in terms of the behavior of Cronin peak and the suppression of $R_{xA}$ at large transverse momentum, $p_T$. The multiplicity of produced particles, which is sensitive to the soft sector of the spectra, is also included in the present analysis.
