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

Abstract : The $J/\psi$ $p_T$ spectrum and nuclear modification factor ($R_{\textit{AA}}$) are reported for $p_T < 5$ GeV/c and $|y|<1$ from 0-60% central Au+Au and Cu+Cu collisions at $\sqrt{s_{_{NN}}} =200$ GeV at STAR. A significant suppression of $p_T$-integrated $J/\psi$ production is observed in central Au+Au events, with less suppression observed in Cu+Cu. The $p_T$ dependence of the $R_{\textit{AA}}$ is observed to increase at a higher $p_T$ region. The data are compared with the previously published RHIC 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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http://hal.in2p3.fr/in2p3-00873021
Contributor : Sylvie Flores <>
Submitted on : Tuesday, October 15, 2013 - 7:23:57 AM
Last modification on : Thursday, February 7, 2019 - 2:55:59 PM

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L. Adamczyk, W. Borowski, S. Kabana. J/ψ production at low pT in Au + Au and Cu + Cu collisions at sNN−−−−√=200 GeV with the STAR detector. Physical Review C, American Physical Society, 2013, 90, pp.024906. ⟨10.1103/PhysRevC.90.024906⟩. ⟨in2p3-00873021⟩

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