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Search for heavy Majorana neutrinos in mu+/- mu+/- + jets events in proton-proton collisions at sqrt(s) = 8 TeV

Abstract : A search is performed for heavy Majorana neutrinos (N) using an event signature defined by two muons of the same charge and two jets (mu+/- mu+/- jj). The data correspond to an integrated luminosity of 19.7 inverse femtobarns of proton-proton collisions at a center-of-mass energy of 8 TeV, collected with the CMS detector at the CERN LHC. No excess of events is observed beyond the expected standard model background and upper limits are set on abs(V[mu,N])^2 as a function of Majorana neutrino mass m[N] for masses in the range of 40-500 GeV, where V[mu,N] is the mixing element of the heavy neutrino with the standard model muon neutrino. The limits obtained are abs(V[mu,N])^2 < 0.00470 for m[N] = 90 GeV, abs(V[mu,N])^2 < 0.0123 for m[N] = 200 GeV, and abs(V[mu,N])^2 < 0.583 for m[N] = 500 GeV. These results extend considerably the regions excluded by previous direct searches.
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http://hal.in2p3.fr/in2p3-01128340
Contributor : Dominique Girod <>
Submitted on : Monday, March 9, 2015 - 3:25:15 PM
Last modification on : Friday, June 5, 2020 - 10:52:08 AM

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V. Khachatryan, M. Besancon, F. Couderc, M. Dejardin, D. Denegri, et al.. Search for heavy Majorana neutrinos in mu+/- mu+/- + jets events in proton-proton collisions at sqrt(s) = 8 TeV. Physics Letters B, Elsevier, 2015, 748, pp.144-166. ⟨10.1016/j.physletb.2015.06.070⟩. ⟨in2p3-01128340⟩

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