TeV-scale Seesaw with Quintuplet Fermions

Abstract

We propose a new seesaw model based on fermionic hypercharge zero weak quintuplet in conjunction with additional scalar quadruplet which attains an induced vev. The model provides both tree-level seesaw ~ v^6/M^5 and a loop-suppressed radiative ~ (1 / 16 π^2) v^2/M contributions to active neutrino masses. The empirical masses m_ν~ 10^{-1} eV can be achieved with M ~ TeV new states, accessible at the LHC. For 5 fb^{-1} of accumulated integrated luminosity at the LHC, there could be ~ 500 doubly-charged Σ^{++} or \bar{Σ^{++}} fermions with mass M_Σ= 400 GeV, leading to interesting multi-lepton signatures. The neutral component of the fermion quintuplet, previously identified as minimal dark matter candidate, becomes unstable in the proposed seesaw setup. The stability can be restored by introducing a Z_2 symmetry, in which case neutrinos get mass only from radiative contributions.

19 pages, 9 figures, corresponds to published version

References in corpus (5)

• Implications of CTEQ global analysis for collider observables
• Distinguishing seesaw models at LHC with multi-lepton signals
• Electroweak scale seesaw and heavy Dirac neutrino signals at LHC
• Critique of Fermionic R\nuMDM and its Scalar Variants
• Cascade Seesaw for Tiny Neutrino Mass

Cited by in corpus (13)

• Hilbert Series for Constructing Lagrangians: expanding the phenomenologist's toolbox
• A Model of Radiative Neutrino Mass: with or without Dark Matter
• A Class of Three-Loop Models with Neutrino Mass and Dark Matter
• Inert Extension of the Zee-Babu Model
• Radiative Generation of Lepton Masses with the $U(1{)}^{\prime }$ Gauge Symmetry
• A Three-Loop Neutrino Model with Global $U(1)$ Symmetry
• Enhancement of $h\to \gamma \gamma$ by seesaw-motivated exotic scalars
• Critique of Fermionic R\nuMDM and its Scalar Variants
• X-ray line in Radiative Neutrino Model with Global $U(1)$ Symmetry
• The signatures of the quintuplet leptons at the LHC
• Looking for hints of a reconstructible seesaw model at the Large Hadron Collider
• Scotogenic R\nuMDM at Three-Loop Level
• Neutrino Masses and TeV-scale Particles Testable at the LHC