Main Image
Volume 345 - International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HardProbes2018) - Heavy Flavours & Quarkonia
Quarkonium measurements in heavy-ion collisions at $\sqrt{s_{\text{NN}}}$ = 200 GeV with the STAR experiment
Z. Liu* on behalf of the STAR collaboration
*corresponding author
Full text: pdf
Pre-published on: 2019 January 11
Published on: 2019 April 24
We present the latest J/$\psi$ and $\Upsilon$ measurements in p+p, p+Au and Au+Au collisions at ${\sqrt{s_{_{\rm NN}}}} = 200\;{\rm GeV}$ by the STAR experiment. In p+p collisions, the inclusive $\Upsilon$ cross section is measured through the di-electron decay channel, while the inclusive J/$\psi$ polarization parameters are obtained from both the di-muon and di-electron channels. The later are compared to the Non-Relativistic QCD (NRQCD) models. In p+Au collisions, the measured nuclear modification factor for J/$\psi$ suggests additional suppression mechanism besides the nuclear PDF (nPDF) effect. The latest $\Upsilon$ measurements in Au+Au collisions reach a higher precision by combining the data sets taken in 2011, 2014 and 2016, compared to previous results. The nuclear modification factors for the ground and excited $\Upsilon$ states in Au+Au collisions are shown as a function of the number of participants, and compared to the results at the LHC as well as to theoretical calculations.
Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.