Relative Modification of Prompt ψ (2S) and J /ψ Yields from pp to PbPb Collisions at √$^{S}$NN =5.02 TeV

Abstract

The relative modification of the prompt psi(2S) and J/psi yields from pp to PbPb collisions, at the center-of- mass energy of 5.02 TeV per nucleon pair, is presented. The analysis is based on pp and PbPb data samples collected by the CMS experiment at the LHC in 2015, corresponding to integrated luminosities of 28.0 pb(-1) and 464 mu b(-1), respectively. The double ratio of measured yields of prompt charmonia reconstructed through their decays into muon pairs,(N-psi(2S)/N J/psi )(PbPb)/(N-psi((2S))/N (J/psi) )(pp),is determined as a function of PbPb collision centrality and charmonium transverse momentum p(T), in two kinematic intervals: broken vertical bar y vertical bar < 1.6 covering 6.5 < pT < 30 GeV/c and 1.6 < broken vertical bar y vertical bar < 2.4 covering 3 < pT < 30 GeV/c. The centrality-integrated double ratios are 0.36 +/- 0.08(stat) +/- 0.05(syst) in the first interval and 0.24 +/- 0.22(stat) +/- 0.09(syst) in the second. The double ratio is lower than unity in all the measured bins, suggesting that the psi(2S) yield is more suppressed than the J/psi yield in the explored phase space.Centre National de la Recherche Scientifique (CNRS)/Institut National de Physique Nucleaire et de Physique des Particules (IN2P3) (France)Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional (CINVESTAV) (Mexico)Institute for the Promotion of Teaching Science and Technology of Thailand (IPST) (Thailand)Secretaria de Educacion Superior, Ciencia, Tecnologia e Innovacion (SENESCYT) (Ecuador)Ministry of Education, Science and Technological Development of Serbia (MESTD) (Serbia)National Science and Technology Development Agency of Thailand (NSTDA) (Thailand)Korean Ministry of Education, Science and Technology (MSIP) (Republic of Korea)Bundesministerium fur Wissenschaft, Forschung und Wirtschaft (BMWFW) (Austria)Secretaria de Estado de Investigacion, Desarrollo e Innovacion (SEIDI) (Spain)