Constraining a general U(1)′ inverse seesaw model from vacuum stability, dark matter, and collider

Abstract

We consider a class of gauged U (1) extensions of the Standard Model (SM), where the light neutrino masses are generated by an inverse seesaw mechanism. In addition to the three right handed neutrinos, we add three singlet fermions and demand an extra Z 2 symmetry under which, the third generations of both of the neutral fermions are odd, which in turn gives us a stable dark matter candidate. We express the U (1) charges of all the fermions in terms of the U(1) charges of the standard model Higgs and the new complex scalar. We study the bounds on the parameters of the model from vacuum stability, perturbative unitarity, dark matter relic density and direct detection constraints. We also obtain the collider constraints on the Z mass and the U (1) gauge coupling. Finally we compare all the bounds on the Z mass versus the U (1) gauge coupling plane.

Dirac neutrino mass generation from a Majorana messenger

“…With the aim of thermalize the right-handed neutrinos with the primordial plasma in the early Universe, we consider an modification of the previous setup by considering a general anomaly free Abelian gauge symmetry with generation-independent charge assignments for the SM fermions, U(1) X . In the Appendix we show that the solutions to the anomaly cancellation conditions allow us to write the X-charges of the SM fields in terms of two parameters [28,[50][51][52], that we choose as…”

Explaining Atomki anomaly and muon g − 2 in U(1)X extended flavour violating two Higgs doublet model

“…We then discuss muon g − 2 and lepton flavour violation(LFV) processes originated from Yukawa interactions in THDM sector. In addition neutrino mass can be generated by introducing right-handed neutrino without U(1) X charge keeping anomaly cancellation condition; neutrino physics is often discussed in extra U(1) models [57,59,[71][72][73][74][75][76][77][78][79]. Taking into account light scalar boson associated with U(1) X breaking, we numerically investigate scalar potential as well as muon g − 2 and LFV constraints searching for allowed parameter region.…”

Multicomponent dark matter in extended U(1)B−L: neutrino mass and high scale validity

“…Likewise |λ i (µ)| < 4π must also hold all along up to the cut-off. Some explorations of high scale validity (HSV) of TeV-scale neutrinos are [24,59,[73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88].…”