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

Adamczyk, L. and Adkins, J. K. and Agakishiev, G. and Aggarwal, M. M. and Ahammed, Z. and Vértesi, Róbert (2016) ϒ production in U + U collisions at √sNN =193 GeV measured with the STAR experiment. PHYSICAL REVIEW C, 94 (6). ISSN 2469-9985

Preview

Text 1608.06487.pdf Available under License Creative Commons Attribution. Download (225kB) | Preview

Abstract

We present a measurement of the inclusive production of ϒ mesons in U+U collisions at √sNN = 193 GeV at mid-rapidity (|y| < 1). Previous studies in central Au+Au collisions at √sNN = 200 GeV show a suppression of ϒ(1S+2S+3S) production relative to expectations from the ϒ yield in p+p collisions scaled by the number of binary nucleon-nucleon collisions (Ncoll), with an indication that the ϒ(1S) state is also suppressed. The present measurement extends the number of participant nucleons in the collision (Npart) 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 ϒ(1S+2S+3S) and ϒ(1S) yields in central U+U data, which consolidates and extends the previously observed suppression trend in Au+Au collisions.

Actions (login required)

Edit Item