Search for heavy neutrinos and W bosons with right-handed couplings in proton–proton collisions at √s=8TeV

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 Hartl, C. 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 Rabady, D. and Rahbaran, B. and Rohringer, H. and Schöfbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, W. and Waltenberger, W. and Wulz, C. -E. and Filipovic, Nicolas 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 Béni, Noémi Tekla and Karancsi, János and Molnár, József and Pálinkás, József and Szillási, Zoltán and Raics, Péter and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2014) Search for heavy neutrinos and W bosons with right-handed couplings in proton–proton collisions at √s=8TeV. EUROPEAN PHYSICAL JOURNAL C, 74 (11). ISSN 1434-6044

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Abstract

A search for heavy, right-handed neutrinos, N` (` = e, µ), and right-handed WR bosons, which arise in the left-right symmetric extensions of the standard model, has been performed by the CMS experiment. The search was based on a sample of two lepton plus two jet events collected in proton-proton collisions at a center-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb−1 . For models with strict left-right symmetry, and assuming only one N` flavor contributes significantly to the WR decay width, the region in the two-dimensional (MWR , MN` ) mass plane excluded at a 95% confidence level extends to approximately MWR = 3.0 TeV and covers a large range of neutrino masses below the WR boson mass, depending on the value of MWR . This search significantly extends the (MWR , MN` ) exclusion region beyond previous results.

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