Υ production in U + U collisions at sNN=193 GeV measured with the STAR experiment

Le résumé fourni par la source

We present a measurement of the inclusive production of $\mathrm{\ensuremath{\Upsilon}}$ mesons in U+U collisions at $\sqrt{{s}_{NN}}=193$ GeV at midrapidity $(|y|<1)$. Previous studies in central Au+Au collisions at $\sqrt{{s}_{NN}}=200$ GeV show a suppression of $\mathrm{\ensuremath{\Upsilon}}(\text{1S+2S+3S})$ production relative to expectations from the $\mathrm{\ensuremath{\Upsilon}}$ yield in p+p collisions scaled by the number of binary nucleon-nucleon collisions $({N}_{\mathrm{coll}})$, with an indication that the $\mathrm{\ensuremath{\Upsilon}}(\text{1S})$ state is also suppressed. The present measurement extends the number of participant nucleons in the collision (${N}_{\mathrm{part}}$) by 20% compared to Au+Au collisions, and allows us to study a system with higher energy density. We observe a suppression in both the $\mathrm{\ensuremath{\Upsilon}}(1\mathrm{S}+2\mathrm{S}+3\mathrm{S})$ and $\mathrm{\ensuremath{\Upsilon}}(1\mathrm{S})$ yields in central U+U data, which consolidates and extends the previously observed suppression trend in Au+Au collisions.

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