2012/04/30 by Krešimir Kumerički, Kresimir Kumericki, Ivica Picek +2 · 102 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Electron #Fermion #Large Hadron Collider #Lepton #Neutrino #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Scalar (mathematics) #Seesaw mechanism #Seesaw molecular geometry #hep-ph
paper · pdf · doi:10.1103/physrevd.86.013006
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 86(1) (American Physical Society) · 19 pages, 9 figures, corresponds to published version
openalex publication_date 2012/07/06 · arxiv created 2012/07/25 · arxiv updated 2012/07/26 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 \ensuremath∼v6/M5 and loop-suppressed radiative \ensuremath∼(1/16\ensuremathπ2)\ifmmode⋅\else\textperiodcentered\fiv2/M contributions to active neutrino masses. The empirical masses m_\ensuremathν\ensuremath∼10^\ensuremath-1 eV can be achieved with M\ensuremath∼TeV new states, accessible at the LHC. For 5 fb^\ensuremath-1 of accumulated integrated luminosity at the LHC, there could be \ensuremath∼500 doubly-charged \ensuremathΣ++ or \ensuremathΣ++ fermions with mass M_\ensuremathΣ=400 GeV, 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 Z2 symmetry, in which case neutrinos get mass only from radiative contributions.