Quarkonium production measured by the STAR experiment
Properties of the Quark Gluon Plasma, created in heavy ion collisions, can be studied by measuring production of various quarkonium states. Each state has a different binding energy and is expected to dissociate at a different temperature in the plasma. By comparing such a sequential suppression pattern to the model calculations, thermodynamical properties of the medium can be extracted. Cold nuclear matter effects however also play a role and can be studied in p+A or d+A collisions. Finally, quarkonium production in p+p collisions has to be measured in order to understand the quarkonium production mechanism.
In these proceedings, we present an overview of $J/\psi$ and $\varUpsilon$ production measured with the STAR experiment. Results from different colliding systems (p+p, p+Au, Au+Au and U+U) are discussed.
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