Relative Modification of Prompt ψ(2S) and J/ψ Yields from pp to PbPb Collisions at [square root]sNN =5.02 TeV
Name
PhysRevLett.118.162301.pdf
Size
385.09 KB
Format
Adobe PDF
Checksum (MD5)
dd21a693a42a6b2480f137a9b9754610
Author(s)
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Apyan, Aram
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Date Issued
April 2017
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Sirunyan, A. M., A. Tumasyan, W. Adam, E. Asilar, T. Bergauer, J. Brandstetter, E. Brondolin, et al. “Relative Modification of Prompt ψ(2S) and J/ψ Yields from pp to PbPb Collisions at [square root]sNN =5.02 TeV.” Physical Review Letters 118, no. 16 (April 20, 2017).
Version
Final published version
Abstract
The relative modification of the prompt ψ(2S) and J/ψ yields from pp to PbPb collisions, at the center-of-mass energy of 5.02 TeV per nucleon pair, is presented. The analysis is based on pp and PbPb data samples collected by the CMS experiment at the LHC in 2015, corresponding to integrated luminosities of 28.0 pb-1 and 464 μb-1, respectively. The double ratio of measured yields of prompt charmonia reconstructed through their decays into muon pairs, (Nψ(2S)/NJ/ψ)PbPb/(Nψ(2S)/NJ/ψ)pp, is determined as a function of PbPb collision centrality and charmonium transverse momentum pT, in two kinematic intervals: |y| < 1.6 covering 6.5 < pT < 30 GeV/c and 1.6 < |y| < 2.4 covering 3 < pT < 30 GeV/c. The centrality-integrated double ratios are 0.36±0.08(stat)±0.05(syst) in the first interval and 0.24±0.22(stat)±0.09(syst) in the second. The double ratio is lower than unity in all the measured bins, suggesting that the ψ(2S) yield is more suppressed than the J/ψ yield in the explored phase space.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.118.162301
