Analysis of the apparent nuclear modification in peripheral Pb-Pb collisions at 5.02 TeV
文献类型：期刊论文
| 作者 | Acharya, S; Acosta, FT; Adamova, D; Adolfsson, J; Aggarwal, MM; Rinella, GA; Agnello, M; Agrawal, N; Ahammed, Z; Ahn, SU |
| 刊名 | PHYSICS LETTERS B
 |
| 出版日期 | 2019 |
| 卷号 | 793期号:-页码:420—432 |
| ISSN号 | 0370-2693 |
| 关键词 | CHARGED-PARTICLE PRODUCTION TRANSVERSE-MOMENTUM CENTRALITY DEPENDENCE JET SUPPRESSION PP |
| DOI | 10.1016/j.physletb.2019.04.047 |
| 文献子类 | 期刊论文 |
| 英文摘要 | Charged-particle spectra at midrapidity are measured in Pb-Pb collisions at the centre-of-mass energy per nucleon-nucleon pair root s(NN) = 5.02 TeV and presented in centrality classes ranging from most central (0-5%) to most peripheral (95-100%) collisions. Possible medium effects are quantified using the nuclear modification factor (R-AA) by comparing the measured spectra with those from proton-proton collisions, scaled by the number of independent nucleon-nucleon collisions obtained from a Glauber model. At large transverse momenta (8 < p(T) < 20 GeV/c), the average R-AA is found to increase from about 0.15 in 0-5% central to a maximum value of about 0.8 in 75-85% peripheral collisions, beyond which it falls off strongly to below 0.2 for the most peripheral collisions. Furthermore, R-AA initially exhibits a positive slope as a function of p(T) in the 8-20 GeV/c interval, while for collisions beyond the 80% class the slope is negative. To reduce uncertainties related to event selection and normalization, we also provide the ratio of R-AA in adjacent centrality intervals. Our results in peripheral collisions are consistent with a PYTHIA-based model without nuclear modification, demonstrating that biases caused by the event selection and collision geometry can lead to the apparent suppression in peripheral collisions. This explains the unintuitive observation that R-AA is below unity in peripheral Pb-Pb, but equal to unity in minimum-bias p-Pb collisions despite similar charged-particle multiplicities. (C) 2019 Conseil Europeen pour la Recherche Nucleaire. Published by Elsevier B.V. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/31472]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 作者单位 | 1.CAPSS, Kolkata, India; 2.Sezione Ist Nazl Fis Nucl, Padua, Italy; 3.Univ Salerno, Dipartimento Fis ER Caianiello, Salerno, Italy; 4.Grp Collegato INFN, Salerno, Italy; 5.Politecn Torino, Dipartimento DISAT, Turin, Italy; 6.Univ Piemonte Orientale, Dipartimento Sci & Innovaz Tecnol, Alessandria, Italy; 7.INFN, Sez Torino, Alessandria, Italy; 8.Dipartimento Interateneo Fis M Merlin, Bari, Italy; 9.Sezione Ist Nazl Fis Nucl, Bari, Italy; 10.European Org Nucl Res CERN, Geneva, Switzerland; |
| 推荐引用方式 GB/T 7714 | Acharya, S,Acosta, FT,Adamova, D,et al. Analysis of the apparent nuclear modification in peripheral Pb-Pb collisions at 5.02 TeV[J]. PHYSICS LETTERS B,2019,793(-):420—432. |
| APA | Acharya, S.,Acosta, FT.,Adamova, D.,Adolfsson, J.,Aggarwal, MM.,...&Zou, S.(2019).Analysis of the apparent nuclear modification in peripheral Pb-Pb collisions at 5.02 TeV.PHYSICS LETTERS B,793(-),420—432. |
| MLA | Acharya, S,et al."Analysis of the apparent nuclear modification in peripheral Pb-Pb collisions at 5.02 TeV".PHYSICS LETTERS B 793.-(2019):420—432. |
入库方式： OAI收割
来源：上海应用物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。