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Phys Rev Lett. 2013 Apr 26;110(17):172002. Epub 2013 Apr 25.

Measurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at sqrt[s]=7  TeV.

Chatrchyan S, Khachatryan V, Sirunyan AM, Tumasyan A, Adam W, Aguilo E, Bergauer T, Dragicevic M, Erö J, Fabjan C, Friedl M, Frühwirth R, Ghete VM, Hörmann N, Hrubec J, Jeitler M, Kiesenhofer W, Knünz V, Krammer M, Krätschmer I, Liko D, Mikulec I, Pernicka M, Rabady D, Rahbaran B, Rohringer C, Rohringer H, Schöfbeck R, Strauss J, Taurok A, Waltenberger W, Wulz CE, Mossolov V, Shumeiko N, Suarez Gonzalez J, Alderweireldt S, Bansal M, Bansal S, Cornelis T, De Wolf EA, Janssen X, Luyckx S, Mucibello L, Ochesanu S, Roland B, Rougny R, Selvaggi M, Van Haevermaet H, Van Mechelen P, Van Remortel N, Van Spilbeeck A, Blekman F, Blyweert S, D'Hondt J, Gonzalez Suarez R, Kalogeropoulos A, Maes M, Olbrechts A, Tavernier S, Van Doninck W, Van Mulders P, Van Onsem GP, Villella I, Clerbaux B, De Lentdecker G, Dero V, Gay AP, Hreus T, Léonard A, Marage PE, Mohammadi A, Reis T, Thomas L, Vander Velde C, Vanlaer P, Wang J, Adler V, Beernaert K, Cimmino A, Costantini S, Garcia G, Grunewald M, Klein B, 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Abstract

The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at sqrt[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 ttZ events and a same-sign dilepton analysis of ttV (V = W or Z) events. In the trilepton channel a direct measurement of the ttZ cross section σ(ttZ) = 0.28(-0.11)(+0.14) (stat)(-0.03)(+0.06) (syst)  pb is obtained. In the dilepton channel a measurement of the ttV cross section yields σ(ttV) = 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.

PMID:
23679709
DOI:
10.1103/PhysRevLett.110.172002
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