Observation of the Υ(3S) meson and suppression of Υ states in PbPb collisions at √ sNN= 5.02 TeV

(CMS Collaboration) Tumasyan, Armen ; ... ; Giljanović, Duje ; Godinović, Nikola ; Lelas, Damir ; Puljak, Ivica ; Antunović, Željko ; Kovač, Marko ; Šćulac, Toni ; Brigljević, Vuko ; Chitroda, Bhakti Kanulal ; Ferenček, Dinko ; Mishra, Saswat ; Roguljić, Matej ; Starodumov, Andrey ; Šuša, Tatjana ; ... ; Bargassa, Pedrame ; ... ; Đurić, Senka ; ... ; Zhokin, Alexander (2024) Observation of the Υ(3S) meson and suppression of Υ states in PbPb collisions at √ sNN= 5.02 TeV. Physical Review Letters, 133 (2). ISSN 0031-9007

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	High energy physics ; Experimental particle physics ; LHC ; CMS ; heavy ion: scattering ; lead ; p p: scattering ; quarkonium: suppression ; dimuon: mass spectrum ; Upsilon(10020): hadroproduction ; Upsilon(10355): hadroproduction ; Upsilon(10020): leptonic decay ; Upsilon(10355): leptonic decay ; muon: pair production ; Upsilon(10020): yield ; Upsilon(10355): yield ; yield: ratio: measured ; peripheral ; transverse momentum dependence ; impact parameter: dependence ; CERN LHC Coll
Subjects:	NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Centre for detectors, sensors and electronics Division of Experimental Physics
Depositing User:	Lorena Palameta
Date Deposited:	25 Sep 2024 11:07
URI:	http://fulir.irb.hr/id/eprint/9088
DOI:	10.1103/PhysRevLett.133.022302

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