出版社:SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要:Quarkonia have been studied in different collision system and energy in order to understand the effects of the hot and dense medium created in heavy-ion collisions. CMS is well suited to measure quarkonia decays to muons given the muon identification and charged particle tracking capability. The J=y and ¡ production in PbPb at psNN = 2:76 TeV and pp collisions at the same per nucleon energy are compared. Prompt and non-prompt J=y contributions are separated for the first time in heavy-ion collisions, as is the ground from the excited states in the ¡ family. CMS observed a suppression in PbPb compared to pp at psNN = 2:76 TeV for B!J=y, prompt J=y, and ¡(1S), as well as the relative suppression of ¡(2S+3S) compared to ¡(1S).