Abstract
Quarkonium states can be used to study the properties of the quark-gluon plasma created in heavy-ion collisions. However, Cold Nuclear Matter (CNM) effects need to be taken into account when interpreting the quarkonium suppression observed in these collisions. In addition, the quarkonium production mechanism in elementary collisions need to be better understood. These proceedings contains an overview of recent quarkonium measurements with the STAR experiment. A comprehensive study of both J/ψ and Υ production is performed in different colliding systems (p+p, p+Au, Au+Au).
Highlights
Quarkonium states like J/ψ or Υ are important probes of quark-gluon plasma properties
Since each quarkonium state has a different radius and binding energy, a sequential suppression is expected, where more tightly bound states dissociate at higher temperatures than the less strongly bound ones
There is a contribution of feed-down from excited quarkonium states
Summary
Quarkonium states like J/ψ or Υ are important probes of quark-gluon plasma properties They are expected to dissociate at high temperature due to Debye-like screening of color charges [1]. Since each quarkonium state has a different radius and binding energy, a sequential suppression is expected, where more tightly bound states dissociate at higher temperatures than the less strongly bound ones. Part of the suppression may be due to cold nuclear matter effects like nuclear absorption, interactions with comovers or modification of parton distributions in nucleons inside nuclei compared to free nucleons These bound nucleons exhibit phenomena like shadowing and anti-shadowing and are included in the nuclear parton distribution functions - nPDFs, which are modified with respect to free nucleon PDFs. the quarkonium production mechanism in elementary proton-proton collisions needs to be fully understood in order to draw firm conclusions.
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