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dc.contributor.authorKhachatryan, V.
dc.contributor.authorIşıldak, Bora
dc.date.accessioned2017-06-15T13:35:43Z
dc.date.available2017-06-15T13:35:43Z
dc.date.issued2014
dc.identifier.issn1434-6052
dc.identifier.urihttps://link.springer.com/article/10.1140/epjc/s10052-014-3060-7
dc.identifier.urihttp://hdl.handle.net/10679/5337
dc.description.abstractA measurement of the cross section for the production of top quark-antiquark pairs (t (t) over bar) in association with a vector boson V (W or Z) in proton-proton collisions at root s = 8 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb(-1) recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and mu) channels: a same-sign dilepton analysis targeting t (t) over barW events, and trilepton and four-lepton analyses designed for t (t) over barZ events. In the same-sign dilepton channel, the t (t) over barW cross section is measured as sigma(t (t) over barW) = 170(-80)(+90) (stat) +/- 70 (syst) fb, corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the t (t) over barZ cross section, sigma(t (t) over barZ) = 200(-70)(+80) (stat)(-30)(+40) (syst)fb(-1), is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive t (t) over barV process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.
dc.description.sponsorshipBMWFW and FWF; FNRS and FWO; CNPq, CAPES, FAPERJ, and FAPESP; MES; CERN; CAS, MOST, and NSFC; COLCIENCIAS; MSES and CSF; RPF; SENESCYT; MoER, ERC IUT and ERDF; Academy of Finland, MEC, and HIP; CEA and CNRS/IN2P3; BMBF, DFG, and HGF; GSRT; OTKA and NIH; DAE and DST; IPM; SFI; INFN; MSIP and NRF; LAS; MOE and UM; BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI; MBIE; PAEC; MSHE and NSC; FCT; JINR; MON, RosAtom, RAS and RFBR; MESTD; SEIDI and CPAN; Swiss Funding Agencies; MST; ThEPCenter, IPST, STAR and NSTDA; TUBITAK and TAEK; NASU and SFFR; STFC; DOE and NSF; the Marie-Curie program and the European Research Council and EPLANET; the Leventis Foundation; the Alfred 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 (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, cofinanced from European Union, Regional Development Fund, the Mobility Plus program of the Ministry of Science and Higher Education, the OPUS program contract 2014/13/B/ST2/02543 and contract Sonata-bis DEC-2012/07/E/ST2/01406 of the National Science Center; the Thalis and Aristeia programs cofinanced by EU-ESF and the Greek NSRF; the National Priorities Research Program by Qatar National Research Fund.
dc.language.isoengen_US
dc.publisherSpringer International Publishingen_US
dc.relationinfo:turkey/grantAgreement/TUBITAK
dc.relation.ispartofEuropean Physical Journal C
dc.rightsrestrictedAccess
dc.titleMeasurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at root s=8 TeVen_US
dc.typeArticleen_US
dc.peerreviewedyes
dc.publicationstatuspublisheden_US
dc.contributor.departmentÖzyeğin University
dc.contributor.authorID124605
dc.contributor.ozuauthorIşıldak, Bora
dc.creatorThe CMS Collaboration
dc.identifier.volume74
dc.identifier.issue9
dc.identifier.wosWOS:000350142400001
dc.identifier.doi10.1140/epjc/s10052-014-3060-7
dc.contributor.authorMale1


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