Comparative analysis of jet and underlying event properties across various models as a function of charged particle multiplicity at 7 TeV*

IF 3.6 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR 中国物理C Pub Date : 2024-08-31 DOI:10.1088/1674-1137/ad5ae9
Maryam Waqar, Haifa I. Alrebdi, Muhammad Waqas, K.S. Al-mugren and Muhammad Ajaz
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Abstract

In this study, a comprehensive analysis of jets and underlying events as a function of charged particle multiplicity in proton-proton (pp) collisions at a center-of-mass energy of TeV is conducted. Various Monte Carlo (MC) event generators, including Pythia8.308, EPOS1.99, EPOSLHC, EPOS4 , and EPOS4 , are employed to predict particle production. The predictions from these models are compared with experimental data from the CMS collaboration. The charged particles are categorized into those associated with underlying events and those linked to jets, and the analysis is restricted to charged particles with and GeV/c. By comparing the MC predictions with CMS data, we find that EPOS , EPOSLHC, and Pythia8 consistently reproduce the experimental results for all charged particles, underlying events, intrajets, and leading charged particles. For charged jet rates with GeV/c, EPOS4 and Pythia8 perform exceptionally well. In the case of charged jet rates with GeV/c, EPOSLHC reproduces satisfactorily good results, whereas EPOS4 exhibits good agreement with the data at higher charged particle multiplicities compared to the other models. This can be attributed to the conversion of energy into flow when "Hydro=on," leading to an increase in multiplicity. The EPOSLHC model describes the data better owing to the new collective flow effects, correlated flow treatment, and parameterization compared to EPOS1.99. However, the examination of the jet spectrum and normalized charged density reveals that EPOS4 , EPOS4 , and EPOSLHC exhibit good agreement with the experimental results, whereas Pythia8 and EPOS1.99 do not perform as well owing to the lack of correlated flow treatment.
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作为 7 TeV 带电粒子倍率函数的各种模型的射流和基本事件特性对比分析*
本研究全面分析了在质心能量为 TeV 的质子-质子(pp)对撞中作为带电粒子倍率函数的喷流和基本事件。采用了各种蒙特卡罗(MC)事件发生器,包括 Pythia8.308、EPOS1.99、EPOSLHC、EPOS4 和 EPOS4,来预测粒子的产生。这些模型的预测结果与 CMS 合作的实验数据进行了比较。带电粒子被分为与基本事件相关的粒子和与射流相关的粒子,分析仅限于和 GeV/c 的带电粒子。通过比较 MC 预测和 CMS 数据,我们发现 EPOS、EPOSLHC 和 Pythia8 始终如一地再现了所有带电粒子、底层事件、内部喷流和前导带电粒子的实验结果。对于 GeV/c 的带电射流率,EPOS4 和 Pythia8 的表现尤为出色。在带电射流率为 GeV/c 的情况下,EPOSLHC 重现了令人满意的结果,而 EPOS4 与其他模型相比,在带电粒子倍率较高的情况下表现出与数据的良好一致性。这可以归因于 "Hydro=on "时能量转化为流量,导致倍率增加。与 EPOS1.99 相比,EPOSLHC 模型由于采用了新的集体流效应、相关流处理方法和参数化方法,因此能更好地描述数据。然而,对射流频谱和归一化带电密度的研究表明,EPOS4、EPOS4 和 EPOSLHC 与实验结果的一致性很好,而 Pythia8 和 EPOS1.99 由于缺乏相关流处理而表现不佳。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
中国物理C
中国物理C 物理-物理:核物理
CiteScore
6.50
自引率
8.30%
发文量
8976
审稿时长
1.3 months
期刊介绍: Chinese Physics C covers the latest developments and achievements in the theory, experiment and applications of: Particle physics; Nuclear physics; Particle and nuclear astrophysics; Cosmology; Accelerator physics. The journal publishes original research papers, letters and reviews. The Letters section covers short reports on the latest important scientific results, published as quickly as possible. Such breakthrough research articles are a high priority for publication. The Editorial Board is composed of about fifty distinguished physicists, who are responsible for the review of submitted papers and who ensure the scientific quality of the journal. The journal has been awarded the Chinese Academy of Sciences ‘Excellent Journal’ award multiple times, and is recognized as one of China''s top one hundred key scientific periodicals by the General Administration of News and Publications.
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