J/ψ production at low pT in Au + Au and Cu + Cu collisions at √SNN = 200 GeV with the STAR detector

Adamczyk, L. and Planinić, Mirko and Poljak, Nikola and Zyzak, M. (STAR Collaboration) (2014) J/ψ production at low pT in Au + Au and Cu + Cu collisions at √SNN = 200 GeV with the STAR detector. Physical Review C, 90 (2). pp. 24906-13. ISSN 0556-2813

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Abstract

The J/ψ pT spectrum and nuclear modification factor (RAA) are reported for pT<5GeV/c and |y|<1 from 0% to 60% central Au+Au and Cu+Cu collisions at √sNN=200GeV at STAR. A significant suppression of pT-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. RAA in Au+Au collisions exhibits a strong suppression at low transverse momentum and gradually increases with pT. The data are compared to high-pT STAR results and previously published BNL Relativistic Heavy Ion Collider results. Comparing with model calculations, it is found that the invariant yields at low pT are significantly above hydrodynamic flow predictions but are consistent with models that include color screening and regeneration.

Item Type: Article
Date: August 2014
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2014) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: mag. bibl. Marija Turković
Date Deposited: 15 Sep 2014 11:00
Last Modified: 17 Sep 2014 13:01
URI: http://digre.pmf.unizg.hr/id/eprint/2761

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