用ATLAS探测器在5.02 TeV的Pb+Pb碰撞中$Z$标记带电粒子产额的介质诱导修饰
Medium-induced modification of $Z$-tagged charged particle yields in Pb+Pb collisions at 5.02 TeV with the ATLAS detector
摘要：
利用大型强子对撞机ATLAS探测器在5.02 TeV/核子对下测量了260 pb $^{-1}$的$pp$和1.7 nb $^{-1}$的Pb+Pb碰撞数据，测量了与具有大横动量的$Z$玻色子（$p_{T}$）相对的带电粒子产额. $Z$玻色子标签用于选择具有特定运动学的硬散射部分子，并观察它们的簇射在Pb+Pb碰撞中产生的夸克-胶子等离子体中传播时如何被修改。与$pp$碰撞相比，Pb+Pb碰撞中的带电粒子产额作为带电粒子$p_{T}$的函数以依赖于事件中心性和$Z$玻色子$p_{T}$的方式显示出显著的变化。的数据进行了比较与各种理论计算，并提供了新的信息介质引起的能量损失的部分子在$p_{T}$制度难以通过其他渠道进行测量。
英文摘要：
The yield of charged particles opposite to a $Z$ boson with large transverse momentum ($p_{T}$) is measured in 260 pb$^{-1}$ of $pp$ and 1.7 nb$^{-1}$ of Pb+Pb collision data at 5.02 TeV per nucleon pair recorded with the ATLAS detector at the Large Hadron Collider. The $Z$ boson tag is used to select hard-scattered partons with specific kinematics, and to observe how their showers are modified as they propagate through the quark-gluon plasma created in Pb+Pb collisions. Compared with $pp$ collisions, charged-particle yields in Pb+Pb collisions show significant modifications as a function of charged-particle $p_{T}$ in a way that depends on event centrality and $Z$ boson $p_{T}$. The data are compared with a variety of theoretical calculations and provide new information about the medium-induced energy loss of partons in a $p_{T}$ regime difficult to measure through other channels.
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