Measurement of the Centrality Dependence of the Dijet Yield in p + Pb Collisions at s NN = 8.16 TeV with the ATLAS Detector
Measurement of the Centrality Dependence of the Dijet Yield in p + Pb Collisions at s NN = 8.16 TeV with the ATLAS Detector
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使用 ATLAS 探测器测量 s NN = 8.16 TeV 下 p Pb 碰撞中 Dijet 产额的中心性依赖性
DOI：
10.1103/physrevlett.132.102301
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发表时间：
2024
影响因子：
8.6
通讯作者：
Aad G
中科院分区：
文献类型：
--
作者：
Aad G
：ATLAS 使用 2016 年在 sqrt[s_{NN}]=8.16 TeV 收集的 165 nb^{-1} p+Pb 数据测量了双射流产率的中心性依赖性。事件中心性反映了 p+Pb 撞击参数，其特征在于前向量热计 Pb 行进侧记录的总横向能量。评估缩放双射流产率的中心与外围比率 R_{CP}，并将结果呈现为反映初始硬部分子散射过程的运动学的变量的函数。 R_{CP} 显示了与源自质子 x_{p} 的部分子的 Bjorken x 的缩放关系，而作为 x_{Pb} 的函数，没有观察到这种趋势。该分析通过覆盖从价区到 x_{p}∼10^{-3} 和 x_{Pb}∼4×10^{-4} 的部分子动量分数，为理解 p+Pb 碰撞中小质子空间构型的作用提供了独特的输入。
: ATLAS measured the centrality dependence of the dijet yield using 165 nb^{-1} of p+Pb data collected at sqrt[s_{NN}]=8.16 TeV in 2016. The event centrality, which reflects the p+Pb impact parameter, is characterized by the total transverse energy registered in the Pb-going side of the forward calorimeter. The central-to-peripheral ratio of the scaled dijet yields, R_{CP}, is evaluated, and the results are presented as a function of variables that reflect the kinematics of the initial hard parton scattering process. The R_{CP} shows a scaling with the Bjorken x of the parton originating from the proton, x_{p}, while no such trend is observed as a function of x_{Pb}. This analysis provides unique input to understanding the role of small proton spatial configurations in p+Pb collisions by covering parton momentum fractions from the valence region down to x_{p}∼10^{-3} and x_{Pb}∼4×10^{-4}.