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 3He +Au collisions at √sNN = 200 GeV

Adare, A. and Makek, Mihael and Vukman, Nikola and Zou, L. (PHENIX Collaboration) (2017) 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 3He +Au collisions at √sNN = 200 GeV. Physical Review C, 95 (3). pp. 34904-10. ISSN 2469-9985

[img]
Preview
PDF - Published Version
Language: English

Download (528kB) | Preview

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 3He +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 3He-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.

Item Type: Article
Date: 9 March 2017
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2017 American Physical Society. Received 23 September 2016. Published 9 March 2017.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 28 Sep 2017 11:17
Last Modified: 28 Sep 2017 11:46
URI: http://digre.pmf.unizg.hr/id/eprint/5589

Actions (login required)

View Item View Item