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J/ψ production at high transverse momenta in p+p and Cu+Cu collisions at sNN=200 GeV

B. I. Abelev et al. (STAR Collaboration)
Phys. Rev. C 80, 041902(R) – Published 27 October 2009

Abstract

The STAR Collaboration at the Relativistic Heavy Ion Collider presents measurements of J/ψe+e at midrapidity and high transverse momentum (pT>5GeV/c) in p+p and central Cu+Cu collisions at sNN=200 GeV. The inclusive J/ψ production cross section for Cu+Cu collisions is found to be consistent at high pT with the binary collision-scaled cross section for p+p collisions. At a confidence level of 97%, this is in contrast to a suppression of J/ψ production observed at lower pT. Azimuthal correlations of J/ψ with charged hadrons in p+p collisions provide an estimate of the contribution of B-hadron decays to J/ψ production of 13%±5%.

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  • Received 2 April 2009

DOI:https://doi.org/10.1103/PhysRevC.80.041902

©2009 American Physical Society

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Vol. 80, Iss. 4 — October 2009

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