Transverse momentum balance of dijets in Xe+Xe collisions at the LHC

IF 3.6 1区 物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Science and Techniques Pub Date : 2024-07-09 DOI:10.1007/s41365-024-01482-6
Yao Li, Shu-Wan Shen, Sa Wang, Ben-Wei Zhang
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Abstract

We present a theoretical study of the medium modifications of the \(p_\textrm{T}\) balance (\(x_\textrm{J}\)) of dijets in Xe+Xe collisions at \(\sqrt{s_\textrm{NN}}=5.44\) TeV. The initial production of dijets was carried out using the POWHEG+PYTHIA8 prescription, which matches the next-to-leading-order (NLO) QCD matrix elements with the parton shower (PS) effect. The SHELL model described the in-medium evolution of nucleus–nucleus collisions using a transport approach. The theoretical results of the dijet \(x_\textrm{J}\) in the Xe+Xe collisions exhibit more imbalanced distributions than those in the p+p collisions, consistent with recently reported ATLAS data. By utilizing the Interleaved Flavor Neutralisation, an infrared-and-collinear-safe jet flavor algorithm, to identify the flavor of the reconstructed jets, we classify dijets processes into three categories: gluon–gluon (gg), quark–gluon (qg), and quark–quark (qq), and investigated the respective medium modification patterns and fraction changes of the gg, qg, and qq components of the dijet sample in Xe+Xe collisions. It is shown that the increased fraction of qg component at a small \(x_\textrm{J}\) contributes to the imbalance of the dijet; in particular, the \(q_1g_2\) (quark-jet-leading) dijets experience more significant asymmetric energy loss than the \(g_1q_2\) (gluon-jet-leading) dijets traversing the QGP. By comparing the \(\Delta \langle x_\textrm{J}\rangle = \langle x_\textrm{J} \rangle _\textrm{pp} - \langle x_\textrm{J} \rangle _\textrm{AA}\) of inclusive, \(c\bar{c}\) and \(b\bar{b}\) dijets in Xe+Xe collisions, we observe \(\Delta \langle x_\textrm{J} \rangle _\mathrm{incl.}>\Delta \langle x_\textrm{J} \rangle _\mathrm{c\bar{c}}>\Delta \langle x_\textrm{J} \rangle _\mathrm{b\bar{b}}\). Moreover, \(\rho _\textrm{Xe, Pb}\), the ratios of the nuclear modification factors of dijets in Xe+Xe to those in Pb+Pb, were calculated, which indicates that the yield suppression of dijets in Pb+Pb is more pronounced than that in Xe+Xe owing to the larger radius of the lead nucleus.

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大型强子对撞机 Xe+Xe 对撞中二射流的横动量平衡
我们介绍了在\(\sqrt{s_\textrm{NN}}=5.44\) TeV的Xe+Xe对撞中二射流的\(p_\textrm{T}\)平衡(\(x_\textrm{J}\))的介质修正的理论研究。二介子的初始产生是使用POWHEG+PYTHIA8处方进行的,该处方将次前沿阶(NLO)QCD矩阵元素与部分子淋雨(PS)效应相匹配。SHELL 模型使用输运方法描述了核-核碰撞的中间演化。Xe+Xe对撞中的dijet \(x_\textrm{J}\)的理论结果比p+p对撞中的dijet \(x_\textrm{J}\)表现出更不平衡的分布,这与最近报告的ATLAS数据一致。我们利用 "交错味道中和"(Interleaved Flavor Neutralisation)--一种红外和共线安全的射流味道算法--来识别重建射流的味道,将二重射流过程分为三类:胶子-胶子(gg)、夸克-胶子(qg)和夸克-夸克(qq),并研究了Xe+Xe对撞中二重射流样本中gg、qg和qq成分各自的介质修饰模式和分数变化。结果表明,在较小的\(x_\textrm{J}\)条件下,qg分量的增加导致了二射流的不平衡;特别是,与穿越QGP的\(g_1q_2\)(胶子射流引导)二射流相比,\(q_1g_2\)(夸克射流引导)二射流经历了更显著的不对称能量损失。通过比较\(\Delta \langle x_\textrm{J}\rangle = \langle x_\textrm{J}.\angle = (矩形 x__textrm{J}) (矩形 x__textrm{pp}) 。- (矩形 x_textrm{J})\在Xe+Xe碰撞中,我們觀察到包羅萬象的(c)和(b)二射線。\三角 x_textrm{J}>。\三角形 x_textrm{J} >\Delta \langle x_textrm{J}\)。此外,还计算了Xe+Xe和Pb+Pb中二射流的核修饰因子之比,这表明由于铅核半径更大,Pb+Pb中二射流的产率抑制比Xe+Xe中更为明显。
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来源期刊
Nuclear Science and Techniques
Nuclear Science and Techniques 物理-核科学技术
CiteScore
5.10
自引率
39.30%
发文量
141
审稿时长
5 months
期刊介绍: Nuclear Science and Techniques (NST) reports scientific findings, technical advances and important results in the fields of nuclear science and techniques. The aim of this periodical is to stimulate cross-fertilization of knowledge among scientists and engineers working in the fields of nuclear research. Scope covers the following subjects: • Synchrotron radiation applications, beamline technology; • Accelerator, ray technology and applications; • Nuclear chemistry, radiochemistry, radiopharmaceuticals, nuclear medicine; • Nuclear electronics and instrumentation; • Nuclear physics and interdisciplinary research; • Nuclear energy science and engineering.
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