Search for Z′ resonances decaying to tt̄ in dilepton+jets final states in pp collisions at √s=7 TeV

Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Aguilo, E. and Bergauer, T. and Dragicevic, M. and Erö, J. and Fabjan, C. and Friedl, M. and Frühwirth, R. and Ghete, V. M. and Hörmann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knünz, V. and Krammer, M. and Krätschmer, I. and Liko, D. and Mikulec, I. and Pernicka, M. and Rabady, D. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and Schöfbeck, R. and Strauss, J. and Taurok, A. and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Molnár, József and Pálinkás, József and Karancsi, János and Raics, Péter and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor and Krajczár, Krisztián (2013) Search for Z′ resonances decaying to tt̄ in dilepton+jets final states in pp collisions at √s=7 TeV. PHYSICAL REVIEW D, 87 (7). ISSN 2470-0010

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Abstract

A search for resonances decaying to top quark-antiquark pairs is performed using a dilepton+jets data sample recorded by the CMS experiment at the LHC in pp colli- sions at √s = 7 TeV corresponding to an integrated luminosity of 5.0 fb−1. No sig- nificant deviations from the standard model background are observed. Upper limits are presented for the production cross section times branching fraction of top quark- antiquark resonances for masses from 750 to 3000 GeV. In particular, the existence of a leptophobic topcolor particle Z′ is excluded at the 95% confidence level for resonance masses MZ′ < 1.3 TeV for ΓZ′ = 0.012MZ′ , and MZ′ < 1.9 TeV for ΓZ′ = 0.10MZ′ .

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