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Measurements of the Υ Meson Production in Au + Au Collisions by the STAR Experiment

, on behalf of the STAR collaboration
Czech Technical University in Prague, 115 19 Praha, Czech Republic
Presented at Hot Quarks 2018-Workshop for Young Scientists on the Physics of Ultrarelativistic Nucleus-Nucleus Collisions, Texel, The Netherlands, 7–14 September 2018.
Proceedings 2019, 10(1), 46; https://doi.org/10.3390/proceedings2019010046
Published: 5 May 2019
PDF [381 KB, uploaded 14 May 2019]

Abstract

In ultra-relativistic heavy-ion collisions, creation of a novel state of matter, the quark-gluon plasma (QGP), has been observed. Suppressed production of quarkonia, caused by the colour screening of the binding force, has been proposed as a direct evidence of the QGP formation. At RHIC energies, other phenomena such as the regeneration and co-mover absorption, are expected to have a small effect for the bottomonium family, which makes Υ a cleaner probe of the screening effect compared to the J / ψ meson. In these proceedings, the latest measurements of the Υ production suppression in Au + Au collisions at s NN = 200 GeV via the di-muon and di-electron decay channels by the STAR experiment at RHIC are presented and compared with data from the LHC and theoretical calculations. Moreover, Υ production measurements in p + p and p + Au collisions are also reported, providing a baseline and a quantification of the cold nuclear matter effects, respectively.
Keywords: upsilon; quarkonium suppression; STAR upsilon; quarkonium suppression; STAR
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Matonoha, O., , on behalf of the STAR collaboration; Measurements of the Υ Meson Production in Au + Au Collisions by the STAR Experiment. Proceedings 2019, 10, 46.

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