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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

Adare, A; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Alfred, M.; Andrieux, V.; Aoki, K.; Apadula, N; Asano, H. and Ayuso, Carmen, et al. (2017) In Physical Review C: covering nuclear physics 95(3).
Abstract

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... (More)

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.

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Physical Review C: covering nuclear physics
volume
95
issue
3
publisher
American Physical Society
external identifiers
  • scopus:85015784602
  • wos:000396021700004
ISSN
2469-9985
DOI
10.1103/PhysRevC.95.034904
language
English
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yes
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1c409739-4171-4cc8-9ca7-5ac80adc9695
date added to LUP
2017-06-13 13:17:50
date last changed
2018-09-30 04:42:11
@article{1c409739-4171-4cc8-9ca7-5ac80adc9695,
  abstract     = {<p>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&lt;|y|&lt;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.</p>},
  articleno    = {034904},
  author       = {Adare, A and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Alfred, M. and Andrieux, V. and Aoki, K. and Apadula, N and Asano, H. and Ayuso, Carmen and Azmoun, B. and Babintsev, V. and Bai, M and Bandara, N. S. and Bannier, B and Barish, K N and Bathe, S and Bazilevsky, A and Beaumier, M. and Beckman, S. and Belmont, R and Berdnikov, A and Berdnikov, Y. and Blau, D. S. and Boer, M. and Bok, J S and Bownes, E. K. and Boyle, K and Brooks, M L and Bryslawskyj, J. and Bumazhnov, V. and Butler, Christopher C. and Campbell, S. and Canoa Roman, V. and Cervantes, R. and Chen, C. H. and Chi, C Y and Chiu, M and Choi, I J and Choi, J B and Chujo, T. and Citron, Z. and Connors, M. and Cronin, N. and Csanád, M and Csörgo, T. and Danley, T. W. and Datta, A. and Oskarsson, A. and Silvermyr, D. and , },
  issn         = {2469-9985},
  language     = {eng},
  month        = {03},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {	Physical Review C: covering nuclear physics},
  title        = {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},
  url          = {http://dx.doi.org/10.1103/PhysRevC.95.034904},
  volume       = {95},
  year         = {2017},
}