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

The STAR collaboration
Aboona, Bassam , Adam, Jaroslav , Adamczyk, Leszek , Adams, Joseph , Aggarwal, Ishu , Aggarwal, Madan , Ahammed, Zubayer , Anderson, Derek , Aschenauer, Elke-Caroline , Atchison, Joseph
Phys.Rev.Lett. 130 (2023) 112301, 2023.
https://doi.org/10.17182/hepdata.133217

Abstract (data 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 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 $\Upsilon$(1S) and $\Upsilon$(2S) are $0.40 \pm 0.03~\textrm{(stat.)} \pm 0.03~\textrm{(sys.)} \pm 0.09~\textrm{(norm.)}$ and $0.26 \pm 0.08~\textrm{(stat.)} \pm 0.02~\textrm{(sys.)} \pm 0.06~\textrm{(norm.)}$, respectively, while the upper limit of the $\Upsilon$(3S) $R_{\mathrm{AA}}$ is 0.17 at a 95\% confidence level. This 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 medium at RHIC whose temperature is sufficiently high to strongly suppress excited $\Upsilon$ states.

  • Figure 2.1

    Data from Figure 2

    10.17182/hepdata.133217.v1/t1

    Inclusive Y(1S) $R_{AA}$ as a function of centrality in Au+Au collisions at 200 GeV. The bin corresponding to $N_{part}$ =...

  • Figure 2.2

    Data from Figure 2

    10.17182/hepdata.133217.v1/t2

    Inclusive Y(2S) $R_{AA}$ as a function of centrality in Au+Au collisions at 200 GeV. The bin corresponding to $N_{part}$ =...

  • Figure 2.3

    Data from Figure 2

    10.17182/hepdata.133217.v1/t3

    Upper limit of inclusive Y(3S) $R_{AA}$ with 95% confidence level in 0-60% Au+Au collisions at 200 GeV

  • Figure 4.1

    Data from Figure 4

    10.17182/hepdata.133217.v1/t4

    Inclusive Y(1S) $R_{AA}$ as a function of $p_{T}$ in Au+Au collisions at 200 GeV. Global uncertainty of 6.8% not shown.

  • Figure 4.2

    Data from Figure 4

    10.17182/hepdata.133217.v1/t5

    Inclusive Y(2S) R_{AA} as a function of p_{T} in Au+Au collisions at 200 GeV. Global uncertainty of 6.8% not shown.

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