arXiv 1807.050902018-07-13hep-exnucl-ex

$+$ $p(d)$ +Au和Au+Au碰撞中用PDMATHAAB和光子触发的双粒子关联进行喷流修正的PHENIX结果

PHENIX results on jet modification with $π^0$- and photon-triggered two particle correlations in $p$$+$$p$, $p(d)$+Au, and Au+Au collisions

J. D. Osborn

备注：: Proceedings for the 27th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2018)
DOI：: 10.1016/j.nuclphysa.2018.08.037

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摘要：

作为无色探针，直接光子以领先的顺序平衡远离侧喷流的$p_T$。因此，直接的光子-强子关联是研究核结构和QCD效应，包括夸克-胶子等离子体中部分子能量损失的极好探针。PHENIX已经测量了$π^{0}$和直接光子触发的两粒子方位角关联，在各种碰撞系统中，从$p$ $+$ $p$到Au+Au，能量为200 GeV。在$p$ $+$ Au和$d$ $+$ Au碰撞中，与$p$ $+$ $p$碰撞相比，对于直接光子触发的相关性，没有观察到每次触发射流产率或远离侧相关性宽度的修改，而对于$p$ $+$ Au中的$π^{0}$触发的相关性，已经测量到远离侧宽度的增加。在Au+Au碰撞中，直接光子已经被统计地识别以及使用隔离切割。结合来自不同碰撞系统的数据集，使我们能够量化从高$z_T$ $(p_{T,h}/p_{T,γ})$的抑制到低$z_T$粒子相对于$p$ $+$ $p$的增强的过渡，并研究这种过渡作为触发器$p_T$的函数。

英文摘要：

As a colorless probe, direct photons balance the $p_T$ of the away-side jet at leading order. Direct photon-hadron correlations are thus an excellent probe for nuclear structure and QCD effects, including parton energy loss in the Quark-Gluon Plasma. PHENIX has measured $π^{0}$ and direct photon-triggered two-particle azimuthal correlations in a variety of collision systems ranging from $p$$+$$p$ to Au+Au at 200 GeV. In $p$$+$Au and $d$$+$Au collisions, no modification of the per-trigger jet yield or away-side correlation width compared to $p$$+$$p$ collisions is observed for direct photon triggered correlations while an increase in the away-side width for $π^{0}$ triggered correlations in $p$$+$Au has been measured. In Au+Au collisions, direct photons have been identified statistically as well as using an isolation cut. Combining data sets from different collision systems allows us to quantify the transition from suppression at high $z_T$ $(p_{T,h}/p_{T,γ})$ to the enhancement of low $z_T$ particles relative to $p$$+$$p$, and to study this transition as a function of trigger $p_T$.

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