Publication:
Coherent J/ψ photoproduction in ultra-peripheral PbPb collisions at √sNN = 2.76 TeV with the CMS experiment

dc.contributor.authorKhachatryan, V.
dc.contributor.authorIşıldak, Bora
dc.contributor.departmentNatural and Mathematical Sciences
dc.contributor.ozuauthorIŞILDAK, Bora
dc.creatorThe CMS Collaboration
dc.date.accessioned2017-12-14T11:26:30Z
dc.date.available2017-12-14T11:26:30Z
dc.date.issued2017-09-10
dc.description.abstractThe cross section for coherent J/psi photoproduction accompanied by at least one neutron on one side of the interaction point and no neutron activity on the other side, Xn0n, is measured with the CMS experiment in ultra-peripheral PbPb collisions at root sNN= 2.76TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 159 mu b(-1), collected during the 2011 PbPb run. The J/psi mesons are reconstructed in the dimuon decay channel, while neutrons are detected using zero degree calorimeters. The measured cross section is d sigma(Xn)o(n)(coh)/dy(J/psi) = 0.36 +/- 0.04 (stat)+/- 0.04 (syst) mbin the rapidity interval 1.8 <vertical bar y vertical bar < 2.3. Using a model for the relative rate of coherent photoproduction processes, this Xn0nmeasurement gives a total coherent photoproduction cross section of d sigma(coh/) dy(J/psi) = 1.82 +/- 0.22 (stat)+/- 0.20 (syst)+/- 0.19 (theo) mb. The data strongly disfavorthe impulse approximation model prediction, indicating that nuclear effects are needed to describe coherent J/psi photoproduction in.+ Pbinteractions. The data are found to be consistent with the leading twist approximation, which includes nuclear gluon shadowing. (C) 2017 The Author(s). Published by Elsevier B.V.en_US
dc.description.sponsorshipBMWFW and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MOST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CSF (Croatia); RPF (Cyprus); MoER, ERC IUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); LAS (Lithuania); MOE and UM (Malaysia); BUAP, CIN-VESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS and RFBR (Russia); MESTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR and NSTDA (Thailand); TÜBİTAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (USA).r Individuals have received support from the Marie-Curie program and the European Research Council and EPLANET (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research, India; the HOMING PLUS program of the Foundation for Polish Science, co-financed from European Union, Regional Development Fund; the Mobility Plus program of the Ministry of Science and Higher Education (Poland); the OPUS program of the National Science Center (Poland); the Thalis and Aristeia programs cofinanced by EU-ESF and the Greek NSRF; the National Priorities Research Program by Qatar National Research Fund; the Programa Clarin-COFUND del Principado de Asturias; the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand); the Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand); and the Welch Foundation, contract C-1845.
dc.identifier.doi10.1016/j.physletb.2017.07.001en_US
dc.identifier.endpage511en_US
dc.identifier.issn0370-2693en_US
dc.identifier.scopus2-s2.0-85030700462
dc.identifier.startpage489en_US
dc.identifier.urihttp://hdl.handle.net/10679/5745
dc.identifier.urihttps://doi.org/10.1016/j.physletb.2017.07.001
dc.identifier.volume772en_US
dc.identifier.wos000411369700071
dc.language.isoengen_US
dc.peerreviewedyesen_US
dc.publicationstatusPublisheden_US
dc.publisherElsevieren_US
dc.relation.ispartofPhysics Letters B
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subject.keywordsCMSen_US
dc.subject.keywordsPhysicsen_US
dc.subject.keywordsHeavy ion collisionsen_US
dc.subject.keywordsUltra-peripheral collisionsen_US
dc.subject.keywordsUPCen_US
dc.subject.keywordsJ/Psien_US
dc.titleCoherent J/ψ photoproduction in ultra-peripheral PbPb collisions at √sNN = 2.76 TeV with the CMS experimenten_US
dc.typeArticleen_US
dspace.entity.typePublication
relation.isOrgUnitOfPublication7a8a2b87-4f48-440a-a491-3c0b2888cbca
relation.isOrgUnitOfPublication.latestForDiscovery7a8a2b87-4f48-440a-a491-3c0b2888cbca

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