TY - JOUR
T1 - Observation of the ϒ(3𝑆) Meson and Suppression of ϒ States in Pb-Pb Collisions at √𝑠𝑁𝑁=5.02 TeV
AU - The CMS Collaboration
AU - Tumasyan, A.
AU - Adam, W.
AU - Eerola, P.
AU - Forthomme, Laurent
AU - Kirschenmann, H.
AU - Österberg, K.
AU - Voutilainen, M.
AU - Bharthuar, Shudhashil
AU - Brücken, Erik
AU - Garcia, F.
AU - Havukainen, J.
AU - Heikkilä, Jaana
AU - Kim, Minsuk
AU - Kinnunen, R.
AU - Lampén, T.
AU - Lassila-Perini, K.
AU - Laurila, S.
AU - Lehti, S.
AU - Lindén, T.
AU - Lotti, Mikko
AU - Luukka, P.
AU - Martikainen, Laura
AU - Myllymäki, Mikael Erkki Johannes
AU - Ott, Jennifer
AU - Pekkanen, Juska
AU - Rantanen, Milla-Maarit
AU - Siikonen, H.
AU - Tuominen, E.
AU - Tuominiemi, J.
AU - Viinikainen, Jussi
AU - Petrow, H.
AU - Tuuva, T.
PY - 2024/7/12
Y1 - 2024/7/12
N2 - 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.
AB - 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.
KW - 114 Physical sciences
U2 - 10.1103/PhysRevLett.133.022302
DO - 10.1103/PhysRevLett.133.022302
M3 - Article
C2 - 39073941
SN - 0031-9007
VL - 133
JO - Physical Review Letters
JF - Physical Review Letters
IS - 2
M1 - 022302
ER -