GeV with the STAR Detector
نویسندگان
چکیده
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. The J /ψ p T spectrum and nuclear modification factor (R AA) are reported for p T < 5 GeV/c and |y| < 1 from 0% to 60% central Au + Au and Cu + Cu collisions at √ s NN = 200 GeV at STAR. A significant suppression of p 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 AA in Au + Au collisions exhibits a strong suppression at low transverse momentum and gradually increases with p T. The data are compared to high-p 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 T are significantly above hydrodynamic flow predictions but are consistent with models that include color screening and regeneration.
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