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Observation of sequential Υ\Upsilon suppression in Au+Au collisions at sNN\sqrt{s_{_\mathrm{NN}}} = 200 GeV with the STAR experiment

Collaboration
Jul 13, 2022
8 pages
Published in:
  • Phys.Rev.Lett. 130 (2023) 11, 112301
  • Published: Mar 14, 2023
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Abstract: (arXiv)
We report on measurements of sequential Υ\Upsilon suppression in Au+Au collisions at sNN\sqrt{s_{_\mathrm{NN}}} = 200 GeV with the STAR detector at the Relativistic Heavy Ion Collider (RHIC) through both the dielectron and dimuon decay channels. In the 0-60% centrality class, the nuclear modification factors (RAAR_{\mathrm{AA}}), which quantify the level of yield suppression in heavy-ion collisions compared to pp+pp collisions, for Υ\Upsilon(1S) and Υ\Upsilon(2S) are 0.40±0.03 (stat.)±0.03 (sys.)±0.09 (norm.)0.40 \pm 0.03~\textrm{(stat.)} \pm 0.03~\textrm{(sys.)} \pm 0.09~\textrm{(norm.)} and 0.26±0.08 (stat.)±0.02 (sys.)±0.06 (norm.)0.26 \pm 0.08~\textrm{(stat.)} \pm 0.02~\textrm{(sys.)} \pm 0.06~\textrm{(norm.)}, respectively, while the upper limit of the Υ\Upsilon(3S) RAAR_{\mathrm{AA}} is 0.17 at a 95% confidence level. This provides experimental evidence that the Υ\Upsilon(3S) is significantly more suppressed than the Υ\Upsilon(1S) at RHIC. The level of suppression for Υ\Upsilon(1S) is comparable to that observed at the much higher collision energy at the Large Hadron Collider. These results point to the creation of a medium at RHIC whose temperature is sufficiently high to strongly suppress excited Υ\Upsilon states.
Note:
  • 5 pages, 4 figures
  • STAR
  • heavy-ion collisions
  • Υ suppression
  • upsilon mesons: suppression
  • heavy ion: scattering
  • temperature: high
  • deconfinement
  • experimental results
  • 200 GeV-cms/nucleon
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