论文标题
$ \ sqrt {s _ {\ rm nn}} = 200 $ gev at star at star in au+au碰撞中的横向快速性的两个粒子相关性
Two-particle correlations on transverse rapidity in Au+Au collisions at $\sqrt{s_{\rm NN}}=200$ GeV at STAR
论文作者
论文摘要
投影到二维的横向快速坐标($ y_ {t1},y_ {t2} $)上的两粒子相关测量,允许访问相对论重型离子碰撞中产生的QCD介质的动力学性能,该角度相关测量不敏感。我们报告了$ \ sqrt {s _ {\ rm nn}} $ = 200 GEV在相对论重型离子Collider(RHIC)进行的200 GEV进行的200 GEV进行的200 GEV进行了$ \ sqrt {s _ {\ rm nn}} $ = 200 GEV。相关性表示为类似符号的横向快速函数的2D函数,与符号和所有带电的粒子对以及粒子对的相对方位角,相对方位角位于近方,外客侧或所有相对方位角上。相关性是使用带有横向动量的带电粒子构建的,$ p_t \ geq 0.15 $ gev/$ c $,pseudorapities从$ -1到1 $ 1到1,而方位角则从$-π$到$π$。观察到的显着相关结构随着碰撞中心性而平稳地进化。主要关联功能包括鞍形形状和一个宽峰,最大接近$ y_t \ 3 $,对应于$ p_t \ $ 1.5 $ 1.5 GEV/$ C $。在类似和符号电荷组合以及近距离和客场相对方位角中都观察到宽峰。将全联邦,全相关性测量与{\ schighing}和{\ sc epos}的理论预测进行比较。结果表明,外围与中央碰撞的相关性近似地描述为核子 +核子碰撞的叠加,而QCD培养基的效应最小。在大多数中央碰撞中表明了强大的中等效应。
Two-particle correlation measurements projected onto two-dimensional, transverse rapidity coordinates ($y_{T1},y_{T2}$), allow access to dynamical properties of the QCD medium produced in relativistic heavy-ion collisions that angular correlation measurements are not sensitive to. We report non-identified charged-particle correlations for Au + Au minimum-bias collisions at $\sqrt{s_{\rm NN}}$ = 200 GeV taken by the STAR experiment at the Relativistic Heavy-Ion Collider (RHIC). Correlations are presented as 2D functions of transverse rapidity for like-sign, unlike-sign and all charged-particle pairs, as well as for particle pairs whose relative azimuthal angles lie on the near-side, the away-side, or at all relative azimuth. The correlations are constructed using charged particles with transverse momentum $p_T \geq 0.15$ GeV/$c$, pseudorapidity from $-$1 to 1, and azimuthal angles from $-π$ to $π$. The significant correlation structures that are observed evolve smoothly with collision centrality. The major correlation features include a saddle shape plus a broad peak with maximum near $y_T \approx 3$, corresponding to $p_T \approx$ 1.5 GeV/$c$. The broad peak is observed in both like- and unlike-sign charge combinations and in near- and away-side relative azimuthal angles. The all-charge, all-azimuth correlation measurements are compared with the theoretical predictions of {\sc hijing} and {\sc epos}. The results indicate that the correlations for peripheral to mid-central collisions can be approximately described as a superposition of nucleon + nucleon collisions with minimal effects from the QCD medium. Strong medium effects are indicated in mid- to most-central collisions.