Search for heavy lepton partners of neutrinos in proton-proton collisions in the context of the type III seesaw mechanism

Abstract

A search is presented in proton-proton collisions at sqrt(s) = 7 TeV for fermionic triplet states expected in type III seesaw models. The search is performed using final states with three isolated charged leptons and an imbalance in transverse momentum. The data, collected with the CMS detector at the LHC, correspond to an integrated luminosity of 4.9 inverse femtobarns. No excess of events is observed above the background predicted by the standard model, and the results are interpreted in terms of limits on production cross sections and masses of the heavy partners of the neutrinos in type III seesaw models. Depending on the considered scenarios, lower limits are obtained on the mass of the heavy partner of the neutrino that range from 180 to 210 GeV. These are the first limits on the production of type III seesaw fermionic triplet states reported by an experiment at the LHC.

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References in corpus (10)

• PYTHIA 6.4 Physics and Manual
• Observation of electron-antineutrino disappearance at Daya Bay
• Vector boson pair production at the LHC
• MCFM for the Tevatron and the LHC
• Distinguishing seesaw models at LHC with multi-lepton signals
• Low energy effects of neutrino masses
• Type-III see-saw at LHC
• Electroweak scale seesaw and heavy Dirac neutrino signals at LHC
• Search for anomalous production of multilepton events in pp collisions at sqrt(s) = 7 TeV
• Search for a W' or techni-rho decaying into WZ in pp collisions at sqrt(s) = 7 TeV

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