Novel TeV-scale seesaw mechanism with Dirac mediators

Details Novel TeV-scale seesaw mechanism with Dirac mediators Novel TeV-scale seesaw mechanism with Dirac mediators

2009-11-08

arxiv.org/abs/0911.1374v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 1 figure, version corresponding to PLB

Scientific paper

10.1016/j.physletb.2010.03.62

We propose novel tree level seesaw mechanism with TeV-scale vectorlike Dirac mediators that produce Majorana masses of the known neutrinos. The gauge quantum number assignment to the Dirac mediators allows them to belong to a weak triplet and a five-plet of nonzero hypercharge. The latter leads to new seesaw formula m_\nu ~ v^6/M^5, so that the empirical masses m_\nu ~ 10^{-1} eV can be achieved by M ~ TeV new states. There is a limited range of the parameter space with M < a few 100 GeV where the tree level contribution dominates over the respective loop contributions and the proposed mechanism is testable at the LHC. We discuss specific signatures for Dirac type heavy leptons produced by Drell-Yan fusion at the LHC.

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