Suppression of excited states relative to the ground state in Pb-Pb collisions at s NN=5.02 TeV

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Asilar, Ece and Bergauer, Thomas and Md. Ali, Mohd. Adli (2018) Suppression of excited states relative to the ground state in Pb-Pb collisions at s NN=5.02 TeV. Physical Review Letters, 120 (14). pp. 142301-1. ISSN 0031-9007 E-ISSN 1079-7114

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Abstract

The relative yields of ϒ mesons produced in pp and Pb-Pb collisions at ffiffiffiffiffiffiffi sNN p ¼ 5.02 TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, ϒð2SÞ and ϒð3SÞ, to the ground state, ϒð1SÞ, in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, ½ϒðnSÞ/ϒð1SÞPb−Pb/½ϒðnSÞ/ϒð1SÞpp, are measured to be 0.308 0.055ðstatÞ 0.019ðsystÞ for the ϒð2SÞ and less than 0.26 at 95% confidence level for the ϒð3SÞ. No significant ϒð3SÞ signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as ϒ transverse momentum and rapidity. No significant dependencies are observed.

Item Type:	Article (Journal)
Additional Information:	7861/65281
Uncontrolled Keywords:	Excited states relative; Ground state; Pb-Pb collisions; NN=5.02 TeV
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 Kulliyyah of Science > Department of Physics
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	31 Jul 2018 09:20
Last Modified:	31 Jul 2018 09:20
URI:	http://irep.iium.edu.my/id/eprint/65281

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