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Testing Novel Seesaw Mediators at the LHC

We propose TeV-scale Dirac fermions producing Majorana masses of the known neutrinos via tree-level seesaw, different from standard type I and III seesaw. The employed weak five-plet with nonzero hypercharge leads to new seesaw formula m_nu ~ v^6/M^5 and to empirical masses m_nu ~10^−1 eV for M ~TeV new states. For a limited range of the parameter space where M ≤ a few 100 GeV the proposed mechanism is testable at the LHC via characteristic decays of Dirac type heavy leptons, produced by a Drell-Yan fusion.

neutrino mass; seesaw; exotic fermions

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