J/ψ Production at Low p[subscript T] in Au + Au and Cu + Cu Collisions at √s[subscript NN] = 200 GeV with the STAR Detector
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Adamczyk-2014-J production at low.pdf
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Author(s)
Stevens, Justin
van Nieuwenhuizen, Gerrit J
Date Issued
August 2014
Journal
Physical Review C
Publisher
American Physical Society
Citation
Adamczyk, L., J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, et al. “J/ψ Production at Low p[subscript T] in Au + Au and Cu + Cu Collisions at √s[subscript NN] = 200 GeV with the STAR Detector.” Phys. Rev. C 90, no. 2 (August 2014). © 2014 American Physical Society
Version
Final published version
Abstract
The J/ψ p[subscript T] spectrum and nuclear modification factor (R[subscript AA]) are reported for p[subscript T] < 5GeV/c and |y| < 1 from 0% to 60% central Au + Au and Cu + Cu collisions at √s[subscript NN] = 200 GeV at STAR. A significant suppression of p[subscript T]-integrated J/ψ production is observed in central Au + Au events. The Cu + Cu data are consistent with no suppression, although the precision is limited by the available statistics. R[subscript AA] in Au + Au collisions exhibits a strong suppression at low transverse momentum and gradually increases with p[subscript T]. The data are compared to high-p[subscript T] STAR results and previously published BNL Relativistic Heavy Ion Collider results. Comparing with model calculations, it is found that the invariant yields at low p[subscript T] are significantly above hydrodynamic flow predictions but are consistent with models that include color screening and regeneration.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevC.90.024906
