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dc.contributor.authorChatrchyan, S.
dc.contributor.authorIşıldak, Bora
dc.description.abstractProduction of prompt J/psi meson pairs in proton-proton collisions at root s = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb(-1). The two J/psi mesons are fully reconstructed via their decays into mu(+)mu(-) pairs. This observation provides for the first time access to the high-transverse-momentum region of J/psi pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/psi transverse momentum (p(T)(J/psi)) and rapidity (vertical bar y(J/psi)vertical bar): vertical bar y(J/psi)vertical bar < 1.2 for p(T)(J/psi) > 6.5 GeV/c; 1.2 < vertical bar y(J/psi)vertical bar < 1.43 for a pT threshold that scales linearly with vertical bar y(J/psi)vertical bar from 6.5 to 4.5 GeV/c; and 1.43 < vertical bar y(J/psi)vertical bar < 2.2 for p(T)(J/psi) > 4.5 GeV/c. The total cross section, assuming unpolarized prompt J/psi pair production is 1.49 +/- 0.07 (stat) +/- 0.13 (syst) nb. Different assumptions about the J/psi polarization imply modifications to the cross section ranging from -31% to +27%.en_US
dc.description.sponsorshipBMWF and FWF ; FNRS and FWO ; CNPq, CAPES, FAPERJ, and FAPESP ; MEYS ; CERN ; CAS, MoST, and NSFC ; COLCIENCIAS ; MSES ; RPF ; MoER, SF0690030s09 and ERDF ; Academy of Finland, MEC, and HIP ; CEA and CNRS/IN2P3 ; BMBF, DFG, and HGF ; GSRT ; OTKA and NKTH ; DAE and DST ; IPM ; SFI ; INFN ; NRF and WCU ; LAS ; CINVESTAV, CONACYT, SEP, and UASLP-FAI ; MSI ; PAEC ; MSHE and NSC ; FCT ; JINR ; MSTD ; SEIDI and CPAN ; Swiss Funding Agencies ; NSC ; ThEPCenter, IPST and NSTDA ; TUBITAK and TAEK ; NASU ; STFC ; DOE and NSF ; the Marie-Curie programme and the European Research Council and EPLANET ; the Leventis Foundation ; the A.P. Sloan Foundation ; the Alexander von Humboldt Foundation ; the Belgian Federal Science Policy Office ; the Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture ; the Agentschap voor Innovatie door Wetenschap en Technologie ; the Ministry of Education, Youth and Sports of Czech Republic ; the Council of Science and Industrial Research, India ; the Compagnia di San Paolo ; the HOMING PLUS programme of Foundation for Polish Science, cofinanced by EU, Regional Development Fund ; and the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF.
dc.publisherSpringer Science+Business Mediaen_US
dc.relation.ispartofJournal of High Energy Physics
dc.titleMeasurement of prompt J/psi pair production in pp collisions at root s = 7 Teven_US
dc.contributor.departmentÖzyeğin University
dc.contributor.authorID(ORCID 0000-0002-0283-5234 & YÖK ID 124605) Işıldak, Bora
dc.contributor.ozuauthorIşıldak, Bora
dc.creatorThe CMS Collaboration
dc.subject.keywordsHadron-Hadron Scatteringen_US
dc.subject.keywordsB physicsen_US

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