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David Silvermyr

David Silvermyr

Senior lecturer

David Silvermyr

Measurement of the relative yields of ψ(2S) to ψ(1S) mesons produced at forward and backward rapidity in p+p, p+Al, p+Au, and He 3 +Au collisions at s NN =200 GeV

Author

  • A Adare
  • C. Aidala
  • N. N. Ajitanand
  • Y. Akiba
  • M. Alfred
  • V. Andrieux
  • K. Aoki
  • N Apadula
  • H. Asano
  • Carmen Ayuso
  • B. Azmoun
  • V. Babintsev
  • M Bai
  • N. S. Bandara
  • B Bannier
  • K N Barish
  • S Bathe
  • A Bazilevsky
  • M. Beaumier
  • S. Beckman
  • R Belmont
  • A Berdnikov
  • Y. Berdnikov
  • D. S. Blau
  • M. Boer
  • J S Bok
  • E. K. Bownes
  • K Boyle
  • M L Brooks
  • J. Bryslawskyj
  • V. Bumazhnov
  • Christopher C. Butler
  • S. Campbell
  • V. Canoa Roman
  • R. Cervantes
  • C. H. Chen
  • C Y Chi
  • M Chiu
  • I J Choi
  • J B Choi
  • T. Chujo
  • Z. Citron
  • M. Connors
  • N. Cronin
  • M Csanád
  • T. Csörgo
  • T. W. Danley
  • A. Datta
  • A. Oskarsson
  • D. Silvermyr
Show all

Summary, in English

The PHENIX Collaboration has measured the ratio of the yields of ψ(2S) to ψ(1S) mesons produced in p+p, p+Al, p+Au, and He3+Au collisions at sNN=200 GeV over the forward and backward rapidity intervals 1.2<|y|<2.2. We find that the ratio in p+p collisions is consistent with measurements at other collision energies. In collisions with nuclei, we find that in the forward (p-going or He3-going) direction, the relative yield of ψ(2S) mesons to ψ(1S) mesons is consistent with the value measured in p+p collisions. However, in the backward (nucleus-going) direction, the ψ(2S) meson is preferentially suppressed by a factor of ∼2. This suppression is attributed in some models to the breakup of the weakly bound ψ(2S) meson through final-state interactions with comoving particles, which have a higher density in the nucleus-going direction. These breakup effects may compete with color screening in a deconfined quark-gluon plasma to produce sequential suppression of excited quarkonia states.

Department/s

  • Particle and nuclear physics

Publishing year

2017-03-09

Language

English

Publication/Series

Physical Review C: covering nuclear physics

Volume

95

Issue

3

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 2469-9985