Measurements of the suppression and correlations of dijets in Pb+Pb collisions at s N N = 5.02 TeV
Measurements of the suppression and correlations of dijets in Pb+Pb collisions at s N N = 5.02 TeV
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s N N = 5.02 TeV 下 Pb Pb 碰撞中双射流的抑制和相关性测量
DOI：
10.1103/physrevc.107.054908
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发表时间：
2023
影响因子：
3.1
通讯作者：
Aad G
中科院分区：
文献类型：
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作者：
Aad G
研究个别Pb+Pb碰撞事件中两个最高横向动量（领先）喷流的相关性，可以提供有关此类碰撞中产生的热而致密的物质对喷流淬灭机制的信息。在Pb+Pb碰撞中，测量了在的前沿双射流横向动量关联.此外，还测量了Pb+Pb碰撞中沿沿着引导喷流和次引导喷流投射的双喷流对核修正因子。测量使用LHC的ATLAS探测器进行，2017年收集了260个数据，2015年和2018年收集了2.2个Pb+Pb数据。一个展开程序应用到二维的领先和subleading射流分布占两个射流的测量实验效果。结果提供的双射流与领先射流大于100。在铅+铅碰撞dijet产量normalizeddistributions的测量表明，不平衡射流的比例增加碰撞相比，这些测量结果与以前的测量相同的数量在2.76重叠的运动学范围。测量了Pb + Pb碰撞中的绝对归一化双喷流率，结果表明，平衡双喷流比不平衡双喷流受到更大的抑制。在对核修正因子的测量中发现，在Pb+Pb碰撞中，在100 ~ 316的中心度范围内，次引导喷流相对于引导喷流被显著抑制。
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 andcollisions at, measurements of the leading dijet transverse momentum () correlations are presented. Additionally, measurements in Pb+Pb collisions of the dijet pair nuclear modification factors projected along leading and subleading jetare made. The measurements are performed using the ATLAS detector at the LHC with 260ofdata collected in 2017 and 2.2of Pb+Pb data collected in 2015 and 2018. An unfolding procedure is applied to the two-dimensional leading and subleading jetdistributions to account for experimental effects in the measurement of both jets. Results are provided for dijets with leading jetgreater than 100. Measurements of the dijet-yield-normalizeddistributions in Pb+Pb collisions show an increased fraction of imbalanced jets compared tocollisions; these measurements are in agreement with previous measurements of the same quantity at 2.76in the overlapping kinematic range. Measurements of the absolutely normalized dijet rate in Pb+Pb andcollisions 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 withbetween 100 and 316for all centralities in Pb+Pb collisions.