Abstract
We propose a new seesaw model based on a fermionic hypercharge-zero weak quintuplet in conjunction with an additional scalar quadruplet which attains an induced vacuum expectation value. The model provides both tree-level seesaw and loop-suppressed radiative contributions to active neutrino masses. The empirical masses can be achieved with new states, accessible at the LHC. For of accumulated integrated luminosity at the LHC, there could be doubly-charged or fermions with mass , leading to interesting multilepton signatures. The neutral component of the fermion quintuplet, previously identified as a minimal dark matter candidate, becomes unstable in the proposed seesaw setup. The stability can be restored by introducing a symmetry, in which case neutrinos get mass only from radiative contributions.
2 More- Received 4 May 2012
DOI:https://doi.org/10.1103/PhysRevD.86.013006
© 2012 American Physical Society