Observation of the ?(3S) meson and suppression of ? states in Pb-Pb collisions at ?sNN=5.02 TeV

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Küçük Resim

Tarih

2024

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

American Physical Society

Erişim Hakkı

info:eu-repo/semantics/openAccess

Özet

The production of Upsilon(2S) and Upsilon(3S) mesons in lead-lead (Pb-Pb) and proton-proton (pp) collisions is studied in their dimuon decay channel using the CMS detector at the LHC. The Upsilon(3S) meson is observed for the first time in Pb-Pb collisions, with a significance above 5 standard deviations. The ratios of yields measured in Pb-Pb and pp collisions are reported for both the Upsilon(2S) and Upsilon(3S) mesons, as functions of transverse momentum and Pb-Pb collision centrality. These ratios, when appropriately scaled, are significantly less than unity, indicating a suppression of Upsilon yields in Pb-Pb collisions. This suppression increases from peripheral to central Pb-Pb collisions. Furthermore, the suppression is stronger for Upsilon(3S) mesons compared to Upsilon(2S) mesons, extending the pattern of sequential suppression of quarkonium states in nuclear collisions previously seen for the J/psi, psi(2S), Upsilon(1S), and Upsilon(2S) mesons.

Açıklama

Anahtar Kelimeler

?sNN=5.02 TeV, Pb-Pb Collisions, Meson and Suppression

Kaynak

Physical Review Letters

WoS Q Değeri

Q1

Scopus Q Değeri

Cilt

133

Sayı

2

Künye