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dc.contributor.authorChatrchyan, S.A.
dc.contributor.authorKhachatryan, Vladimir A.
dc.contributor.authorSirunyan, A.M.
dc.contributor.authorTumasyan, A.R.
dc.contributor.authorBaarmand, Marc M.
dc.contributor.authorDorney, B.
dc.contributor.authorHohlmann, Marcus
dc.contributor.authorKalakhety, Himali
dc.contributor.authorVodopiyanov, Igor
dc.contributor.authorYumiceva, Francisco
dc.date.accessioned2013-11-20T21:55:28Z
dc.date.available2013-11-20T21:55:28Z
dc.date.issued2013-04-25
dc.identifier.citationChatrchyan, S., Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Aguilo, E., . . . Swanson, J. (2013). Measurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at √s=7 TeV. Physical Review Letters, 110(17)en_US
dc.identifier.urihttp://hdl.handle.net/11141/187
dc.description.abstractThe first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at √s=7 TeV is presented. The results are based on a data set corresponding to an integrated luminosity of 5.0 fb-1, recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of tt̄Z events and a same-sign dilepton analysis of tt̄V (V=W or Z) events. In the trilepton channel a direct measurement of the tt̄Z cross section σtt̄Z=0.28-0.11+0.14 (stat)-0.03+0.06 (syst) pb is obtained. In the dilepton channel a measurement of the tt̄V cross section yields σtt̄V=0.43-0.15+0.17 (stat)-0.07+0.09 (syst) pb. These measurements have a significance, respectively, of 3.3 and 3.0 standard deviations from the background hypotheses and are compatible, within uncertainties, with the corresponding next-to-leading order predictions of 0.137-0.016+0.012 and 0.306-0.053+0.031 pb.en_US
dc.language.isoen_USen_US
dc.rightsThis published article is available in accordance with the publisher's policy. It may be subject to U.S. copyright law.en_US
dc.rights.urihttp://publish.aps.org/authors/transfer-of-copyright-agreementen_US
dc.titleMeasurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at √s=7 TeVen_US
dc.typeArticleen_US
dc.identifier.doi10.1103/PhysRevLett.110.172002


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