"Table 61" of "Correlations between jets and charged particles in PbPb and pp collisions at sqrt(s[NN])= 2.76 TeV"

CERN-LHC. The quark-gluon plasma is studied via medium-induced changes to correlations between jets and charged particles in PbPb collisions compared to pp reference data. This analysis uses data sets from PbPb and pp collisions with integrated luminosities of 166 inverse microbarns and 5.3 inverse picobarns, respectively, collected at sqrt(s[NN]) = 2.76 TeV. The angular distributions of charged particles are studied as a function of relative pseudorapidity (Delta eta) and relative azimuthal angle (Delta phi) with respect to reconstructed jet directions. Charged particles are correlated with all jets with transverse momentum (pT) above 120 GeV, and with the leading and subleading jets (the highest and second-highest in pT, respectively) in a selection of back-to-back dijet events. Modifications in PbPb data relative to pp reference data are characterized as a function of PbPb collision centrality and charged particle pT. A centrality-dependent excess of low-pT particles is present for all jets studied, and is most pronounced in the most central events. This excess of low-pT particles follows a Gaussian-like distribution around the jet axis, and extends to large relative angles of Delta eta ~ 1 and Delta phi ~1.

欧洲核子研究中心大型强子对撞机（CERN-LHC）数据集。本研究通过对比质子质子（pp）参照数据，分析铅铅（PbPb）碰撞中喷注与带电粒子间关联的介质诱导变化，以此探究夸克胶子等离子体（quark-gluon plasma）。本次分析使用了在质心系能量√s_NN = 2.76太电子伏特（TeV）下采集的数据，其中铅铅碰撞与质子质子碰撞的积分亮度（integrated luminosity）分别为166反微靶恩与5.3反皮靶恩。我们以相对于重建喷注方向的相对赝快度（Δη）和相对方位角（Δφ）为变量，研究带电粒子的角分布。将横向动量（transverse momentum，p_T）大于120 GeV的所有喷注，以及筛选出的背对背双喷注事件中的领头喷注与次领头喷注（即横向动量分别最高与第二高的喷注）与带电粒子进行关联分析。相对于质子质子参照数据，铅铅碰撞数据中的修正特征以碰撞中心度与带电粒子横向动量为变量进行表征。在所研究的全部喷注中均存在与碰撞中心度相关的低横向动量粒子过剩现象，且该现象在最中心的碰撞事件中最为显著。这类低横向动量粒子的过剩分布呈现类高斯（Gaussian-like）形态，围绕喷注轴延伸至Δη~1与Δφ~1的大相对角度范围。