Trilepton signals: the golden channel for seesaw searches at LHC
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Wydawnictwo Uniwersytetu Jagiellonskiego
Majorana neutrinosNeutrino massesLepton numberElectroweak interactions
Águila, F.; Aguilar-Saavedra, J.A.; Blas, J. Trilepton signals: the golden channel for seesaw searches at LHC. Acta Physica Polonica B, 40(11): 290-2911 (2009). 
SponsorshipThis work has been supported by MEC project FPA2006-05294, Junta de Andalucía projects FQM 101 and FQM 03048, and by the European Community’s Marie-Curie Research Training Network under contract MRTN-CT-2006-035505 “Tools and Precision Calculations for Physics Discoveries at Colliders”. J.A.A.-S. acknowledges support by a MEC Ramón y Cajal contract.
The comparison of samples with different number of charged leptons shows that trilepton signals are the most significant ones for seesaw mediators. As previously pointed out, this is indeed the case for scalar Δ (type II) and fermion Σ (type III) triplets at LHC, which can be discovered in this channel for masses up to 500–700 GeV and an integrated luminosity of 30 fb−1; whereas fermion singlets N (type I) are marginally observable if there are no further new physics near the TeV scale. However, if there are new gauge interactions at this scale coupling to right-handed neutrinos, as in left–right models, heavy neutrinos are observable up to masses ∼ 2 TeV for new gauge boson masses up to ∼ 4 TeV, as we discuss in some detail.