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Exotic Seesaw-Motivated Heavy Leptons at the LHC
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We study the LHC potential for discovering TeV-scale SU(2)_L 5-plet fermions introduced recently to explain small neutrino masses. We show that the Drell-Yan production and the decays of new exotic Sigma leptons are testable at the LHC. Their production is abundant due to nontrivial electroweak gauge charges. For 1 fb^-1 of integrated luminosity at the present LHC sqrt{s}=7 TeV, there can be 270 Sigma-Sigmabar pairs produced for M_Sigma = 400 GeV. Besides producing same-sign dilepton events, they could lead, due to a chosen small mixing between heavy and light leptons, to ~10 golden decays Sigma^{+++}(Sigma^{+++}-bar) --> W^\pm W^\pm l^\pm with a specific decay signature.
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Thermal Leptogenesis in the BNT Model of Neutrino Mass
In the BNT neutrino-mass model, thermal leptogenesis can explain the observed baryon asymmetry with triplet masses above roughly 3.5e7 GeV in the hierarchical case and as low as 1.7 TeV with resonant enhancement.
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