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Measurement of nuclear modification factors of ?(1S), ?(2S), and ?(3S) mesons in PbPb collisions at ?sNN=5.02 TeV

Abstract: The cross sections for ?(1S), ?(2S), and ?(3S) production in lead?lead (PbPb) and proton?proton (pp) collisions at ?sNN=5.02 TeV have been measured using the CMS detector at the LHC. The nuclear modification factors, RAA, derived from the PbPb-to-pp ratio of yields for each state, are studied as functions of meson rapidity and transverse momentum, as well as PbPb collision centrality. The yields of all three states are found to be significantly suppressed, and compatible with a sequential ordering of the suppression, RAA(?(1S))>RAA(?(2S))>RAA(?(3S)). The suppression of ?(1S) is larger than that seen at ?sNN=2.76TeV, although the two are compatible within uncertainties. The upper limit on the RAA of ?(3S) integrated over pT, rapidity and centrality is 0.096 at 95% confidence level, which is the strongest suppression observed for a quarkonium state in heavy ion collisions to date.

 Fuente: Physics Letters B, 790, 270?293 (2019)

 Editorial: Elsevier

 Fecha de publicación: 01/03/2019

 Nº de páginas: 24

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2019.01.006

 ISSN: 0370-2693,1873-2445

 Url de la publicación: https://doi.org/10.1016/j.physletb.2019.01.006