Abstract
The suppression of J/ψ production in heavy-ion collisions compared to p+p collisions, caused by the color screening in the deconfined medium, has been proposed as a signature of the formation of the Quark-Gluon Plasma. However, J/ψ production rates are also sensitive to other effects such as the cold nuclear matter effects and recombination. To understand the interplay of these mechanisms, it is important to study J/ψ production for different collision geometries.In these proceedings, we present recent result on J/ψ production via the di-electron decay channel from the STAR experiment at RHIC in p+p collisions at √sNN = 200, 500 GeV, in d+Au collisions at √sNN = 200 GeV and in heavy-ion collisions, specifically Au+Au collisions at √sNN = 200 GeV and U+U collisions at √sNN = 193 GeV. We also show measurements on J/ψ production via the di-muon decay channel in p+p collisions at √sNN = 500 GeV and in Au+Au collisions at √sNN = 200 GeV using the newly installed Muon Telescope Detector.
Highlights
Quarkonium production is one of the essential probes to study the properties of the Quark-Gluon Plasma (QGP) formed in relativistic heavy-ion collisions
The suppression of its production due to the color-screening effect in the medium has been proposed as a direct evidence of the QGP formation [1]
The modification of quarkonium production in nucleus+nucleus collisions (A+A) with respect to p+p collisions is usually quantified as the so-called nuclear modification factor (RAA): RAA
Summary
Quarkonium production is one of the essential probes to study the properties of the Quark-Gluon Plasma (QGP) formed in relativistic heavy-ion collisions. Other effects can affect the observed J/ψ yields These effects include firstly Cold Nuclear Matter (CNM) effects such as initial state parton scattering, nuclear shadowing and nuclear absorption, and secondly regeneration via coalescence of deconfined charm quarks. To understand these different mechanisms, it is important to study the quarkonium production in different collision systems and at different collision energies. The modification of quarkonium production in nucleus+nucleus collisions (A+A) with respect to p+p collisions is usually quantified as the so-called nuclear modification factor (RAA): RAA It is defined as the ratio of particle yields in A+A collisions to that in p+p collisions scaled by the average number of binary collisions < Ncoll >. Telescope Detector (MTD) [3]
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