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Probing seesaw at LHC

Borut Bajc·Miha Nemevsek·Goran Senjanovic
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Abstract

We have recently proposed a simple SU(5) theory with an adjoint fermionic multiplet on top of the usual minimal spectrum. This leads to the hybrid scenario of both type I and type III seesaw and it predicts the existence of the fermionic SU(2) triplet between 100 GeV and 1 TeV for a conventional GUT scale of about 10^{16} GeV, with main decays into W (Z) and leptons, correlated through Dirac Yukawa couplings, and lifetimes shorter than about 10^{-12} sec. These decays are lepton number violating and they offer an exciting signature of Delta L=2 dilepton events together with 4 jets at future pp (p\bar p) colliders. Increasing the triplet mass endangers the proton stability and so the seesaw mechanism could be directly testable at LHC.

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Borut Bajc, Miha Nemevsek, Goran Senjanovic. 2007-10-26. Probing seesaw at LHC. https://doi.org/10.1103/physrevd.76.055011

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