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- W4285598075 abstract "We report on measurements of sequential $Upsilon$ 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 di-electron and di-muon 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 $Upsilon$(1S) and $Upsilon$(2S) are $0.40 pm 0.03~textrm{(stat.)} pm 0.03~textrm{(sys.)} pm 0.07~textrm{(norm.)}$ and $0.26 pm 0.07~textrm{(stat.)} pm 0.02~textrm{(sys.)} pm 0.04~textrm{(norm.)}$, respectively, while the upper limit of the $Upsilon$(3S) $R_{mathrm{AA}}$ is 0.20 at a 95% confidence level. This observation provides experimental evidence that the $Upsilon$(3S) is significantly more suppressed than the $Upsilon$(1S) at RHIC. The level of suppression for $Upsilon$(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 deconfined medium at RHIC whose temperature is sufficiently high to strongly suppress excited $Upsilon$ states." @default.
- W4285598075 created "2022-07-16" @default.
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- W4285598075 date "2022-07-15" @default.
- W4285598075 modified "2023-10-01" @default.
- W4285598075 title "Observation of sequential _ suppression in Au+Au collisions at psNN = 200 GeV with the STAR experiment" @default.
- W4285598075 doi "https://doi.org/10.48550/arxiv.2207.06568" @default.
- W4285598075 hasPublicationYear "2022" @default.
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