Charged-particle nuclear modification factors in PbPb and pPb collisions at √sNN=5.02 TeV

Khachatryan, Vardan and Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Aşilar, Ece and Bergauer, Thomas and Md. Ali, Mohd. Adli (2017) Charged-particle nuclear modification factors in PbPb and pPb collisions at √sNN=5.02 TeV. Journal of High Energy Physics, 2017 (4). pp. 1-36. ISSN 1029-8479 E-ISSN 1126-6708

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Abstract

The spectra of charged particles produced within the pseudorapidity window |η| < 1 at √ sNN = 5.02 TeV are measured using 404 µb −1 of PbPb and 27.4 pb−1 of pp data collected by the CMS detector at the LHC in 2015. The spectra are presented over the transverse momentum ranges spanning 0.5 < pT < 400 GeV in pp and 0.7 < pT < 400 GeV in PbPb collisions. The corresponding nuclear modification factor, RAA, is measured in bins of collision centrality. The RAA in the 5% most central collisions shows a maximal suppression by a factor of 7–8 in the pT region of 6–9 GeV. This dip is followed by an increase, which continues up to the highest pT measured, and approaches unity in the vicinity of pT = 200 GeV. The RAA is compared to theoretical predictions and earlier experimental results at lower collision energies. The newly measured pp spectrum is combined with the pPb spectrum previously published by the CMS Collaboration to construct the pPb nuclear modification factor, RpA, up to 120 GeV. For pT > 20 GeV, RpA exhibits weak momentum dependence and shows a moderate enhancement above unity.

Item Type:	Article (Journal)
Additional Information:	7861/62596
Uncontrolled Keywords:	Charged-particle nuclear; factors in PbPb and pPb collisions
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	02 Apr 2018 12:03
Last Modified:	21 Jun 2018 09:34
URI:	http://irep.iium.edu.my/id/eprint/62596

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