The production of gamma(2S) and gamma(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 gamma(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 gamma(2S) and gamma(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 gamma yields in Pb-Pb collisions. This suppression increases from peripheral to central Pb-Pb collisions. Furthermore, the suppression is stronger for gamma(3S) mesons compared to gamma(2S) mesons, extending the pattern of sequential suppression of quarkonium states in nuclear collisions previously seen for the J/psi, psi(2S), gamma(1S), and gamma(2S) mesons.

Tumasyan, A., Adam, W., Andrejkovic, J.w., Bergauer, T., Chatterjee, S., Damanakis, K., et al. (2024). Observation of the ϒ(3S) Meson and Suppression of ϒ States in Pb-Pb Collisions at √sNN=5.02 TeV. PHYSICAL REVIEW LETTERS, 133(2), 1-20 [10.1103/PhysRevLett.133.022302].

Observation of the ϒ(3S) Meson and Suppression of ϒ States in Pb-Pb Collisions at √sNN=5.02 TeV

Battilana, C;Bonacorsi, D;Castro, A;Cuffiani, M;Diotalevi, T;Fanfani, A;Giommi, L;Guiducci, L;Rovelli, T;Siroli, GP;
2024

Abstract

The production of gamma(2S) and gamma(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 gamma(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 gamma(2S) and gamma(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 gamma yields in Pb-Pb collisions. This suppression increases from peripheral to central Pb-Pb collisions. Furthermore, the suppression is stronger for gamma(3S) mesons compared to gamma(2S) mesons, extending the pattern of sequential suppression of quarkonium states in nuclear collisions previously seen for the J/psi, psi(2S), gamma(1S), and gamma(2S) mesons.
2024
Tumasyan, A., Adam, W., Andrejkovic, J.w., Bergauer, T., Chatterjee, S., Damanakis, K., et al. (2024). Observation of the ϒ(3S) Meson and Suppression of ϒ States in Pb-Pb Collisions at √sNN=5.02 TeV. PHYSICAL REVIEW LETTERS, 133(2), 1-20 [10.1103/PhysRevLett.133.022302].
Tumasyan, A; Adam, W; Andrejkovic, Jw; Bergauer, T; Chatterjee, S; Damanakis, K; Dragicevic, M; Del Valle, Ae; Hussain, Ps; Jeitler, M; Krammer, N; Le...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1007739
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