Search for a W′ boson decaying to a bottom quark and a top quark in pp collisions at √s = 7 TeV

Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Erö, J. and Fabjan, C. and Friedl, M. and Frühwirth, R. and Ghete, V. M. and Hammer, J. and Hörmann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knünz, V. and Krammer, M. and Liko, D. and Mikulec, I. and Pernicka, M. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and Schöfbeck, R. and Strauss, J. and Taurok, A. and Wagner, P. and Waltenberger, W. and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Béni, Noémi Tekla and Czellár, Sándor and Molnár, József and Pálinkás, József and Szillási, Zoltán and Karancsi, János and Raics, Péter and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor and Krajczár, Krisztián (2013) Search for a W′ boson decaying to a bottom quark and a top quark in pp collisions at √s = 7 TeV. PHYSICS LETTERS B, 718 (4-5). pp. 1229-1251. ISSN 0370-2693

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Abstract

Results are presented from a search for a W′ boson using a dataset corresponding to 5.0 fb−1 of integrated luminosity collected during 2011 by the CMS experiment at the LHC in pp collisions at √s = 7 TeV. The W′ boson is modeled as a heavy W boson, but different scenarios for the couplings to fermions are considered, involving both left- handed and right-handed chiral projections of the fermions, as well as an arbitrary mixture of the two. The search is performed in the decay channel W′ → tb, leading to a final state signature with a single electron or muon, missing transverse energy, and jets, at least one of which is identified as a b-jet. A W′ boson that couples to the right-handed (left-handed) chiral projections of the fermions with the same coupling constants as the W is excluded for masses below 1.85 (1.51) TeV at the 95% confidence level. For the first time using LHC data, constraints on the W′ gauge couplings for a set of left- and right-handed coupling combinations have been placed. These results represent a significant improvement over previously published limits.

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