Suppression of Excited ϒ States Relative to the Ground State in Pb-Pb Collisions at √s[subscript NN] = 5.02 TeV
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PhysRevLett.120.142301.pdf
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Author(s)
Sirunyan, A. M.
Tumasyan, A.
Adam, W.
Asilar, E.
Bergauer, T.
Brandstetter, J.
Brondolin, E.
Dragicevic, M.
Erö, J.
Flechl, M.
Date Issued
April 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Sirunyan, A. M., et al. “Suppression of Excited ϒ States Relative to the Ground State in Pb-Pb Collisions at √s[subscript NN] = 5.02 TeV.” Physical Review Letters, vol. 120, no. 14, Apr. 2018.
Version
Final published version
Abstract
The relative yields of ϒ mesons produced in pp and Pb-Pb collisions at √s[subscript NN]=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, ϒ(2S) and ϒ(3S), to the ground state, ϒ(1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [ϒ(nS)/ϒ(1S)][subscript Pb-Pb]/[ϒ(nS)/ϒ(1S)][subscript pp], are measured to be 0.308±0.055(stat)±0.019(syst) for the ϒ(2S) and less than 0.26 at 95% confidence level for the ϒ(3S). No significant ϒ(3S) 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.120.142301
