Observation of the $Υ$(3S) meson and suppression of $Υ$ states in PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV
Fuente:
arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866913434568753152 |
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| author | CMS Collaboration |
| author_facet | CMS Collaboration |
| contents | The production of $Υ$(2S) and $Υ$(3S) mesons in lead-lead (PbPb) and proton-proton (pp) collisions is studied in their dimuon decay channel using the CMS detector at the LHC. The $Υ$(3S) meson is observed for the first time in PbPb collisions, with a significance above five standard deviations. The ratios of yields measured in PbPb and pp collisions are reported for both the $Υ$(2S) and $Υ$(3S) mesons, as functions of transverse momentum and PbPb collision centrality. These ratios, when appropriately scaled, are significantly less than unity, indicating a suppression of $Υ$ yields in PbPb collisions. This suppression increases from peripheral to central PbPb collisions. Furthermore, the suppression is stronger for $Υ$(3S) mesons compared to $Υ$(2S) mesons, extending the pattern of sequential suppression of quarkonium states in nuclear collisions previously seen for the $ψ$/J, $ψ$(2S), $Υ$(1S), and $Υ$(2S) mesons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_17026 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Observation of the $Υ$(3S) meson and suppression of $Υ$ states in PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV CMS Collaboration High Energy Physics - Experiment Nuclear Experiment The production of $Υ$(2S) and $Υ$(3S) mesons in lead-lead (PbPb) and proton-proton (pp) collisions is studied in their dimuon decay channel using the CMS detector at the LHC. The $Υ$(3S) meson is observed for the first time in PbPb collisions, with a significance above five standard deviations. The ratios of yields measured in PbPb and pp collisions are reported for both the $Υ$(2S) and $Υ$(3S) mesons, as functions of transverse momentum and PbPb collision centrality. These ratios, when appropriately scaled, are significantly less than unity, indicating a suppression of $Υ$ yields in PbPb collisions. This suppression increases from peripheral to central PbPb collisions. Furthermore, the suppression is stronger for $Υ$(3S) mesons compared to $Υ$(2S) mesons, extending the pattern of sequential suppression of quarkonium states in nuclear collisions previously seen for the $ψ$/J, $ψ$(2S), $Υ$(1S), and $Υ$(2S) mesons. |
| title | Observation of the $Υ$(3S) meson and suppression of $Υ$ states in PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV |
| topic | High Energy Physics - Experiment Nuclear Experiment |
| url | https://arxiv.org/abs/2303.17026 |