Nuclear modification of Y states in pPb collisions at √sNN = 5.02 TeV
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Tumasyan, A.; Cabrillo Bartolomé, José Ibán; Calderón Tazón, Alicia; Chazin Quero, Bárbara; Duarte Campderros, Jorge; Fernández García, Marcos; Fernández Manteca, Pedro José; García Alonso, Andrea; Gómez Gramuglio, Gervasio; Martínez Rivero, Celso; Martínez Ruiz de Árbol, Pablo; Matorras Weinig, Francisco; Piedra Gómez, Jonatan; Prieëls, Cedric; Ricci-Tam, Francesca Shun-Ning Annarosa; Rodrigo Anoro, Teresa; Ruiz Jimeno, Alberto; Russo, Lorenzo; Scodellaro, Luca; [et al.]Fecha
2022Derechos
Attribution 4.0 International. © 2022 The Author(s). Published by Elsevier B.V
Publicado en
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2022, 835, 137397
Editorial
Elsevier
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Palabras clave
CMS
Bottomonium
Quarkonium suppression
Quark-gluon plasma
Heavy ion collisions
Resumen/Abstract
Production cross sections of Υ(1S), Υ(2S), and Υ(3S) states decaying into μ+μ− in proton-lead (pPb) collisions are reported using data collected by the CMS experiment at √sNN = 5.02 TeV. A comparison is made with corresponding cross sections obtained with pp data measured at the same collision energy and scaled by the Pb nucleus mass number. The nuclear modification factor for Υ(1S) is found to be RpPb(Υ(1S)) = 0.806±0.024 (stat)±0.059 (syst). Similar results for the excited states indicate a sequential suppression pattern, such that RpPb(Υ(1S)) > RpPb(Υ(2S)) > RpPb(Υ(3S)). The suppression of all states is much less pronounced in pPb than in PbPb collisions, and independent of transverse momentum p Υ T and center-of-mass rapidity y Υ CM of the individual Υ state in the studied range p Υ T < 30 GeV/c and |y Υ CM| < 1.93. Models that incorporate final-state effects of bottomonia in pPb collisions are in better agreement with the data than those which only assume initial-state modifications.
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