论文标题
$ \ sqrt {s _ {_ \ text {nn}}} $ = 5.02 TEV的pb+pb碰撞中dijets的抑制和相关性的测量
Measurements of the suppression and correlations of dijets in Pb+Pb collisions at $\sqrt{s_{_\text{NN}}}$ = 5.02 TeV
论文作者
论文摘要
对单个PB+PB碰撞事件中两个最高横向动量（领先）喷头的相关性的研究可以提供有关此类碰撞中产生的热和密集物质的喷气淬火机理的信息。在$ \ sqrt {s _ {_ \ text {nn}}} $ = 5.02 tev中，在$ \ sqrt {s _ {_ {_ \ sqrt {s _ {s _ {s _ {s _ {$ p _ {$ p _ {\ mathrm {t}}} $）的相关性中的Pb colltions中的PB+PB和PP碰撞（s _ {_ \ text {nn}}} $ = 5.02中，在$ \ sqrt {s _ {_ \ text {nn}}}中（$ \ sqrt {此外，制作了沿前导和旋转喷气机$ p _ {\ mathrm {t}} $的Dijet对核修饰因子的PB+PB碰撞的测量值。使用LHC的Atlas检测器进行测量，并使用2017年收集的260 pb $^{ - 1} $的PP数据和2015年和2018年收集的PB+PB数据的2.2 Nb $^{ - 1} $。用于测量两种喷气机的实验效应。为Dijets提供了带领先的Jet $ P _ {\ Mathrm {t}} $大于100 GEV的结果。 Dijet Yield差异化的$ x _ {\ Mathrm {J}} $分布在PB+PB碰撞中的测量表明，与PP碰撞相比，喷射不平衡的部分增加了；这些测量值与重叠运动范围内2.76 TEV相同数量的先前测量值一致。还提出了PB+PB和PP碰撞中绝对归一化的Dijet速率的测量值，并表明平衡的二颗粒比PB+PB碰撞中的dijets明显更抑制。在对成对核修饰因子的测量中观察到，对于$ p _ {\ mathrm {t}} $ 100至316 GEV的PB+PB碰撞中的所有中心之间的$ p _ {\ mathrm {t}} $相对于领先的喷气机而被显着抑制。
Studies of the correlations of the two highest transverse momentum (leading) jets in individual Pb+Pb collision events can provide information about the mechanism of jet quenching by the hot and dense matter created in such collisions. In Pb+Pb and pp collisions at $\sqrt{s_{_\text{NN}}}$ = 5.02 TeV, measurements of the leading dijet transverse momentum ($p_{\mathrm{T}}$) correlations are presented. Additionally, measurements in Pb+Pb collisions of the dijet pair nuclear modification factors projected along leading and subleading jet $p_{\mathrm{T}}$ are made. The measurements are performed using the ATLAS detector at the LHC with 260 pb$^{-1}$ of pp data collected in 2017 and 2.2 nb$^{-1}$ of Pb+Pb data collected in 2015 and 2018. An unfolding procedure is applied to the two-dimensional leading and subleading jet $p_{\mathrm{T}}$ distributions to account for experimental effects in the measurement of both jets. Results are provided for dijets with leading jet $p_{\mathrm{T}}$ greater than 100 GeV. Measurements of the dijet-yield-normalized $x_{\mathrm{J}}$ distributions in Pb+Pb collisions show an increased fraction of imbalanced jets compared to pp collisions; these measurements are in agreement with previous measurements of the same quantity at 2.76 TeV in the overlapping kinematic range. Measurements of the absolutely-normalized dijet rate in Pb+Pb and pp collisions are also presented, and show that balanced dijets are significantly more suppressed than imbalanced dijets in Pb+Pb collisions. It is observed in the measurements of the pair nuclear modification factors that the subleading jets are significantly suppressed relative to leading jets with $p_{\mathrm{T}}$ between 100 and 316 GeV for all centralities in Pb+Pb collisions.
