Measurement of sequential ${\rm Y}$ suppression in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 200 GeV with the STAR experiment

Abstract

We report on measurements of sequential ${\rm Y}$ suppression in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 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 ($R_{\mathrm{AA}}$), which quantify the level of yield suppression in heavy-ion collisions compared to $p$+$p$ collisions, for ${\rm Y}$(1S) and ${\rm Y}$(2S) are $0.40\pm 0.03\text{(stat.)}\pm 0.03\text{(sys.)}\pm 0.09\text{(norm.)}$ and $0.26\pm 0.08\text{(stat.)}\pm 0.02\text{(sys.)}\pm 0.06\text{(norm.)}$, respectively, while the upper limit of the ${\rm Y}$(3S) $R_{\mathrm{AA}}$ is 0.17 at a 95% confidence level. This provides experimental evidence that the ${\rm Y}$(3S) is significantly more suppressed than the ${\rm Y}$(1S) at RHIC. The level of suppression for ${\rm Y}$(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 ${\rm Y}$ states.

arXiv comment5 pages, 4 figures

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• Production of ${\rm Y}(\text{nS})$ mesons in Pb+Pb and $pp$ collisions at 5.02 TeV
• Observation of the ${\rm Y}$(3S) meson and suppression of ${\rm Y}$ states in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
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