Right-handed neutrino dark matter under the B-L gauge interaction

TL;DR

This paper explores right-handed neutrino dark matter within a minimal B-L gauge extension of the standard model, analyzing its relic density, mass range, and testability through upcoming experiments.

Contribution

It introduces a comprehensive analysis of right-handed neutrino dark matter under B-L gauge interaction, including relic density mechanisms and experimental prospects.

Findings

Viable dark matter mass range from keV to TeV scale.

Sub-electroweak B-L gauge boson scenarios are consistent with dark matter physics.

Parameter regions can be tested with planned experiments like CERN SHiP.

Abstract

We study the right-handed neutrino (RHN) dark matter candidate in the minimal U(1)_{B-L} gauge extension of the standard model. The U(1)_{B-L} gauge symmetry offers three RHNs which can address the origin of the neutrino mass, the relic dark matter, and the matter-antimatter asymmetry of the universe. The lightest among the three is taken as the dark matter candidate, which is under the B-L gauge interaction. We investigate various scenarios for this dark matter candidate with the correct relic density by means of the freeze-out or freeze-in mechanism. A viable RHN dark matter mass lies in a wide range including keV to TeV scale. We emphasize the sub-electroweak scale light B-L gauge boson case, and identify the parameter region motivated from the dark matter physics, which can be tested with the planned experiments including the CERN SHiP experiment.