Analysis of the apparent nuclear modification in peripheral Pb-Pb collisions at 5.02 TeV

doi:10.1016/j.physletb.2019.04.047

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Analysis of the apparent nuclear modification in peripheral Pb-Pb collisions at 5.02 TeV
	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
	2019
卷号	793 期号:-页码:420—432
关键词	CHARGED-PARTICLE PRODUCTION TRANSVERSE-MOMENTUM CENTRALITY DEPENDENCE JET SUPPRESSION PP
ISSN号	0370-2693
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
内容类型	期刊论文
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.