BARC/PUB/2017/0401

 
 

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

 
     
 
Author(s)

Adare, A.; Aidala, C.; Ajitanand, N. N.; Mishra, D. K.; Mohanty, A. K.; Sett, P.; Shukla, P.; and others
(NPD)

Source

Physical Review-C, 2017. Vol. 95 (3): pp. 034904.1-034904.10

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.

 
 
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