Abstract
In a model with an extra $U(1)$ gauge to SM gauge group, we have shown the allowed region of masses of extra gauge boson and the dark matter which is the lightest one among other right-handed Majorana fermions present in the model. To obtain this region, we have used bounds coming from constraints on active-sterile neutrino masses and mixing from various oscillation experiments, constraint on dark matter relic density obtained by PLANCK together with the constraint on the extra gauge boson mass and its gauge coupling recently obtained by ATLAS Collaboration at LHC. From the allowed regions, it is possible to get some lower bounds on the masses of the extra gauge boson and the dark matter and considering those values it is possible to infer what could be the spontaneous symmetry breaking scale of an extra $U(1)$ gauge symmetry.
Highlights
Standard Model (SM) has got tremendous success in describing various phenomena at the elementary particle level, but SM failed to account for two major experimental results, one related to the existence of dark matter (DM) [1] in the Universe and the other related to neutrino oscillation phenomena that require neutrinos to be massive and significant mixings among different flavors of neutrinos
With LHC constraint along with relic abundance constraint and constraint on Δ and θ, we have studied the possibility of lower bounds on mass of X boson and the dark matter mass and the corresponding Uð1Þ gauge coupling gX
We have considered a model [17] which is an Uð1Þ extension of SM, in which neutrino masses have been studied extensively and the mass of neutrinos has been connected to dark matter which is stabilized by a residual Z2 symmetry of the spontaneously broken Uð1Þ gauge symmetry
Summary
Standard Model (SM) has got tremendous success in describing various phenomena at the elementary particle level, but SM failed to account for two major experimental results, one related to the existence of dark matter (DM) [1] in the Universe and the other related to neutrino oscillation phenomena that require neutrinos to be massive and significant mixings among different flavors of neutrinos. There are recent indications in the Fermilab experiment [15] about some nonzero mixing among active and sterile neutrinos with sterile neutrino mass in the eV scale [16] In connection with these observational results, we have considered here an Uð1Þ gauge extended model [17], which contains dark matter fields and can accommodate active-sterile neutrino masses and mixing. In this model, right-handed Majorana fermion is found to be a suitable candidate for dark matter as discussed later.
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