Scalar dark matter, neutrino mass and leptogenesis in a U(1) B-L model

We investigate the phenomenology of singlet scalar dark matter (DM) in a simple U(1)( B-L ) gauge extension of the standard model, made anomaly-free with four exotic fermions. The enriched scalar sector and the new gauge boson Z ', associated with U(1) gauge extension, connect the dark sector to the visible sector. We compute relic density, consistent with Planck limit and a Z ' mediated DM-nucleon cross section, compatible with PandaX bound. The mass of Z ' and the corresponding gauge coupling are constrained from LEP-II and LHC dilepton searches. We also briefly scrutinize the tree-level neutrino mass with a dimension five operator. Furthermore, resonant leptogenesis phenomena is discussed with TeV-scale exotic fermions to produce the observed baryon asymmetry of the Universe. Further, we briefly explain the impact of flavor in leptogenesis and we also project the combined constraints on Yukawa, consistent with oscillation data and observed baryon asymmetry. Additionally, we restrict the new gauge parameters by using the existing data on branching ratios of rare B(tau) decay modes. We see that the constraints from the dark sector are much more stringent from the flavor sector.

Automated summary

Research on the phenomenology of singlet scalar dark matter in a simple U(1)( B-L ) gauge extension of the standard model was conducted, with the addition of four exotic fermions for anomaly-free conditions. The study focused on calculating relic density, DM-nucleon cross section, mass of Z ' and gauge coupling, as well as discussing the impact of flavor in leptogenesis. Constraints on new gauge parameters were also examined, revealing more stringent restrictions from the dark sector compared to the flavor sector.