Measurement of quark- and gluon-like jet fractions using jet charge in PbPb and pp collisions at 5.02 TeV
Measurement of quark- and gluon-like jet fractions using jet charge in PbPb and pp collisions at 5.02 TeV
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DOI：
10.1007/jhep07(2020)115
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发表时间：
2020-04
影响因子：
5.4
通讯作者：
Cms Collaboration
中科院分区：
文献类型：
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作者：
Cms Collaboration
喷流内部粒子电荷的动量加权总和，即所谓的喷注电荷，对引发部分子簇射的粒子的电荷很敏感。本文给出了用大型强子对撞机的CMS探测器记录的=5.02TeV铅-铅(PBPB)碰撞和质子-质子(Pp)碰撞中的喷注电荷分布。这些数据分别对应于pbpb和pp碰撞的404pb−1和27.4pb−1的积分亮度。利用喷注电荷对夸克和胶子电荷基本差异的敏感性，利用模拟事件的喷注电荷分布作为模板，从数据中提取类似夸克和胶子的喷注分数。通过比较PP和PBPB数据作为碰撞铅核(中心性)重叠的函数，考察了这些喷流组分的修正。这项测量测试了由于与夸克-胶子等离子体的相互作用而造成的喷注能量损失与颜色电荷的关系。在提取的类夸克和类胶子喷流组分中，没有观察到不同中心性类别之间以及相对于pp结果的显著修改。
The momentum-weighted sum of the electric charges of particles inside a jet, known as jet charge, is sensitive to the electric charge of the particle initiating the parton shower. This paper presents jet charge distributions in= 5. 02 TeV lead-lead (PbPb) and proton-proton (pp) collisions recorded with the CMS detector at the LHC. These data correspond to integrated luminosities of 404 μb− 1 and 27.4 pb− 1 for PbPb and pp collisions, respectively. Leveraging the sensitivity of the jet charge to fundamental differences in the electric charges of quarks and gluons, the jet charge distributions from simulated events are used as templates to extract the quark-and gluon-like jet fractions from data. The modification of these jet fractions is examined by comparing pp and PbPb data as a function of the overlap of the colliding Pb nuclei (centrality). This measurement tests the color charge dependence of jet energy loss due to interactions with the quark-gluon plasma. No significant modification between different centrality classes and with respect to pp results is observed in the extracted quark-and gluon-like jet fractions.