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Published April 20, 2017 | Submitted + Published + Supplemental Material
Journal Article Open

Relative Modification of Prompt ψ(2S) and J/ψ Yields from pp to PbPb Collisions at √s_NN = 5.02  TeV


The relative modification of the prompt ψ(2S) and J/ψ 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 μb^(−1), respectively. The double ratio of measured yields of prompt charmonia reconstructed through their decays into muon pairs, (N_ψ(2S)/N_J/ψ)_PbPb/(N_ψ(2S)/N_J/ψ)_pp, is determined as a function of PbPb collision centrality and charmonium transverse momentum p_T, in two kinematic intervals: |y| < 1.6 covering 6.5 < p_T < 30 GeV/c and 1.6 < |y| < 2.4 covering 3 < p_T < 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 ψ(2S) yield is more suppressed than the J/ψ yield in the explored phase space.

Additional Information

© 2017 CERN, for the CMS. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Received 4 November 2016; revised manuscript received 5 March 2017; published 20 April 2017. We congratulate our colleagues in the Conseil Européen pour la Recherche Nucléaire (CERN) accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centers and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: Bundesministerium für Wissenschaft, Forschung und Wirtschaft (BMWFW) and Austrian Science Fund (FWF) (Austria); Belgian Fonds de la Recherche Scientifique (FNRS) and Belgian Fonds voor Wetenschappelijk Onderzoek (FWO) (Belgium); Conselho Nacional de Desenvolvimento Cientifico e Tecnelógica (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Fundação de Amparo à Pesquisa do Estado de Rio de Janeiro (FAPERJ), and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (Brazil); Bulgarian Ministry of Education and Science (MES) (Bulgaria); CERN; Chinese Academy of Sciences (CAS), Ministry of Science and Technology (MoST), and Chinese National Natural Science Foundation of China (NSFC) (China); Colombian Funding Agency (COLCIENCIAS) (Colombia); Croatian Ministry of Science, Education and Sport (MSES) and Croatian Science Foundation (CSF) (Croatia); Research Promotion Foundation (RPF) (Cyprus); Secretaría de Educación Superior, Ciencia, Tecnología e Innovación (SENESCYT) (Ecuador); Ministry of Education and Research (MoER), Estonian Research Council via IUT23-4 and IUT23-6 (ERC IUT), and European Regional Development Fund (ERDF) (Estonia); Academy of Finland, Finnish Ministry of Education and Culture (MEC), and Helsinki Institute of Physics (HIP) (Finland); Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA) and Centre National de la Recherche Scientifique (CNRS)/Institut National de Physique Nucléaire et de Physique des Particules (IN2P3) (France); Bundesministerium für Bildung und Forschung (BMBF), Deutsche Forschungsgemeinschaft (DFG), and Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF) (Germany); General Secretariat for Research and Technology (GSRT) (Greece); Országos Tudományos Kutatási Alapprogramok (OTKA) and National Innovation Office (NIH) (Hungary); Department of Atomic Energy (DAE) and Department of Science and Technology (DST) (India); Institute for Research in Fundamental Studies (IPM) (Iran); Science Foundation (SFI) (Ireland); Istituto Nazionale di Fisica Nucleare (INFN) (Italy); Korean Ministry of Education, Science and Technology (MSIP) and National Research Foundation of Korea (NRF) (Republic of Korea); Lithuanian Academy of Sciences (LAS) (Lithuania); Ministry of Education (MOE) and University of Malaya (UM) (Malaysia); Benemérita Universidad Autónoma de Puebla (BUAP), Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV), Consejo Nacional de Ciencia y Tecnología (CONACYT), Laboratorio Nacional de Supercómputo del Sureste (LNS), Secretaría de Educación Pública (SEP), and Universidad Autónoma de San Luis Potosí (UASLP-FAI) (Mexico); Ministry of Business, Innovation and Employment (MBIE) (New Zealand); Pakistan Atomic Energy Commission (PAEC) (Pakistan); Ministry of Science and Higher Education (MSHE) and National Science Centre (NSC) (Poland); Fundação para a Ciência e a Tecnologia (FCT) (Portugal); Joint Institute for Nuclear Research (JINR) (Dubna); Ministry of Education and Science of the Russian Federation (MON), Federal Agency of Atomic Energy of the Russian Federation (RosAtom), Russian Academy of Sciences (RAS), and Russian Foundation for Basic Research (RFBR) (Russia); Ministry of Education, Science and Technological Development of Serbia (MESTD) (Serbia); Secretaría de Estado de Investigación, Desarrollo e Innovación (SEIDI) and Programa Consolider-Ingenio 2010 (CPAN) (Spain); Swiss Funding Agencies (Switzerland); Ministry of Science and Technology (MST) (Taipei); Thailand Center of Excellence in Physics (ThEPCenter), Institute for the Promotion of Teaching Science and Technology of Thailand (IPST), Special Task Force for Activating Research (STAR), and National Science and Technology Development Agency of Thailand (NSTDA) (Thailand); Scientific and Technical Research Council of Turkey (TUBITAK) and Turkish Atomic Energy Authority (TAEK) (Turkey); National Academy of Sciences of Ukraine (NASU) and State Fund for Fundamental Researches (SFFR) (Ukraine); Science and Technology Facilities Council (STFC) (United Kingdom); and US Department of Energy (DOE) and US National Science Foundation (NSF) (USA).

Attached Files

Published - PhysRevLett.118.162301.pdf

Submitted - 1611.01438.pdf

Supplemental Material - HIN-16-004_supp-jnl.pdf


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