Observation of Sequential Υ Suppression in PbPb Collisions
Chatrchyan, S.; Khachatryan, V; Sirunyan, Albert M.; Tumasyan, A.; Adam, W.; Aguilo, E.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Carrillo Moreno, Salvador; Vázquez Valencia, Elsa Fabiola; CMS Collaboration (2012)