Abstract
Thermal suppression of quarkonium production in heavy-ion collisions, due to Debye screening of the quark-antiquark potential, has been proposed as a clear signature of quark-gluon plasma (QGP) formation. At RHIC energies, the Υ meson is a clean probe of the early system thanks to negligible levels of enhancement from bb̄ recombination and non-thermal suppression from co-mover absorption. We report on our measurement of the Υ → e+e− cross section in Au+Au collisions at =200 GeV. We compute the Nuclear Modification Factor by comparing these results to p+p collisions. In order to have a complete assessment of both hot and cold nuclear matter effects on Upsilon production we also report on results from d+Au collisions.
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