Jet shape modification at LHC energies by JEWEL

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英文篇名：Jet shape modification at LHC energies by JEWEL 作者：万仁卓 ; 丁雷 ; 桂熙 ; 杨帆 ; 李双 ; 周代翠 英文作者：Ren-Zhuo Wan;Lei Ding;Xi Gui;Fan Yang;Shuang Li;Dai-Cui Zhou;Nano Optical Material and Storage Device Research Center, School of Electronic and Electrical Engineering, Wuhan Textile University;College of Science, China Three Gorges University;Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University; 英文关键词：quark gluon plasma;;jet quenching;;jet suppression;;jet shape modifications;;jet structure 中文刊名：KNWL 英文刊名：中国物理C 机构：Nano Optical Material and Storage Device Research Center, School of Electronic and Electrical Engineering, Wuhan Textile University;College of Science, China Three Gorges University;Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University; 出版日期：2019-05-15 出版单位：Chinese Physics C 年：2019 期：v.43 基金：Supported by National Natural Science Foundation of China(11505130,11847014,11775097 and CCNU18ZDPY04) 语种：英文; 页：KNWL201905015 页数：7 CN：05 ISSN：11-5641/O4 分类号：111-117

摘要

Jet shape measurements are employed to explore the microscopic evolution mechanisms of parton-medium interaction in ultra-relativistic heavy-ion collisions. In this study, jet shape modifications are quantified in terms of the fragmentation function F(z), relative momentum p_T~(rel), density of charged particles p(r), jet angularity girth, jet momentum dispersion p_T~(disp),and LeS ub for proton-proton(pp) collisions at 0.9, 2.76. 5.02, 7,and 13 TeV, as well as for lead-lead collisions at 2.76 TeV and 5.02 TeV by JEWEL. A differential jet shape parameter Dgirth is proposed and studied at a smaller jet radius r < 0.3. The results indicate that the medium has the dominant effect on jet shape modification, which also has a weak dependence on the center-of-mass energy. Jet fragmentation is enhanced significantly at very low z < 0.02, and fragmented jet constituents are linearly spread to larger jet-radii for p_T~(rel) < 1. The waveform attenuation phenomena is observed in p_T~(rel),girth, and Dgirth distributions. The results obtained for D_(girth) from pp to Pb + Pb, where the wave-like distribution in pp collision is ahead of Pb + Pb collisions at small jetradii, indicates a strong medium effect.
        Jet shape measurements are employed to explore the microscopic evolution mechanisms of parton-medium interaction in ultra-relativistic heavy-ion collisions. In this study, jet shape modifications are quantified in terms of the fragmentation function F(z), relative momentum p_T~(rel), density of charged particles p(r), jet angularity girth, jet momentum dispersion p_T~(disp),and LeS ub for proton-proton(pp) collisions at 0.9, 2.76. 5.02, 7,and 13 TeV, as well as for lead-lead collisions at 2.76 TeV and 5.02 TeV by JEWEL. A differential jet shape parameter Dgirth is proposed and studied at a smaller jet radius r < 0.3. The results indicate that the medium has the dominant effect on jet shape modification, which also has a weak dependence on the center-of-mass energy. Jet fragmentation is enhanced significantly at very low z < 0.02, and fragmented jet constituents are linearly spread to larger jet-radii for p_T~(rel) < 1. The waveform attenuation phenomena is observed in p_T~(rel),girth, and Dgirth distributions. The results obtained for D_(girth) from pp to Pb + Pb, where the wave-like distribution in pp collision is ahead of Pb + Pb collisions at small jetradii, indicates a strong medium effect.

引文

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