Probing seesaw at LHC
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.
Cite
@article{arxiv.hep-ph/0703080,
title = {Probing seesaw at LHC},
author = {Borut Bajc and Miha Nemevsek and Goran Senjanovic},
journal= {arXiv preprint arXiv:hep-ph/0703080},
year = {2008}
}
Comments
19 pages, discussion on leptogenesis added, new references, main conclusions unchanged