Jet modification in absence of QGP-medium: the role of multiparton interactions and color reconnection

IF 3.1 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR
Prottoy Das, Abhi Modak, Debjani Banerjee, Rathijit Biswas, Supriya Das, Sanjay Kumar Ghosh, Sibaji Raha, Sidharth Kumar Prasad
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引用次数: 1

Abstract

Abstract Recent studies of high-multiplicity events in small collision systems (proton-proton and proton-lead) have drawn research interest towards the possibility of the formation of partonic medium in such systems. One of the important consequences of the formation of dense partonic medium is quenching of high-momentum final-state particles resulting in several experimental observations such as suppression in nuclear modification factor $R_{\rm AA}$, modification of jet shape observable $\rho(r)$ and jet fragmentation ($z^{\rm ch}$) distributions, etc. In this work, we study $\rho(r)$ and $z^{\rm ch}$ for inclusive charged-particle jets in proton-proton (pp) collisions at $\sqrt{s}$~=~13~TeV using PYTHIA~8 Monash~2013 Monte Carlo simulation. We show that the color reconnection (CR) and multiparton interaction (MPI) mechanisms in PYTHIA~8 can lead to an increased rate of jet production. We also find that the mechanisms of MPI and CR and change in the gluonic contribution in high-multiplicity events result in significant modification of $\rho(r)$ and $z^{\rm ch}$ compared to those in minimum bias events for 10~$
无qgp介质的喷流改性:多组分相互作用和颜色重连的作用
摘要近年来对小型碰撞系统(质子-质子和质子-铅)中高多重事件的研究引起了人们对此类系统中形成部分子介质的可能性的研究兴趣。致密部分子介质形成的一个重要结果是高动量终态粒子的猝灭,导致了核修饰因子$R_{\rm AA}$的抑制、可观测到的射流形状的修饰$\rho(r)$和射流破碎($z^{\rm ch}$)分布等实验观察结果。在这项工作中,我们使用PYTHIA 8 Monash 2013蒙特卡罗模拟研究了$\sqrt{s}$ = 13 TeV的质子-质子(pp)碰撞中$\rho(r)$和$z^{\rm ch}$包含带电粒子喷流。我们发现,PYTHIA 8中的颜色重连(CR)和多部子相互作用(MPI)机制可以导致射流产生速率的增加。我们还发现,与最小偏倚事件(10 $<p_{\rm T,\,jet}^{\rm ch}<$ 20 GeV/ $c$)相比,MPI和CR的机制以及高多样性事件中胶子贡献的变化导致$\rho(r)$和$z^{\rm ch}$的显著改变。我们注意到$\langle N_{\rm MPI}\rangle$和胶子贡献与$\rho(r)$中修饰量的直接联系——mpi和/或胶子贡献的数量越大,$\rho(r)$的修饰量就越大。本作品的内容可以在知识共享署名3.0许可条款下使用。本作品的任何进一步分发必须保留作者的归属和作品的标题,期刊引用和DOI。文章由SCOAP3资助,中国物理学会、中国科学院高能物理研究所、中国科学院现代物理研究所、IOP出版有限公司授权发表。
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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