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We explore an anomaly-free ${\textrm U}(1)$ gauge extended beyond theStandard model (BSM) framework, to account for the baryon asymmetry of theUniverse, along with arranging for tiny neutrino mass. Neutrino masses aregenerated via higher-dimensional operators (HDOs) involving three right-handedneutrinos (RHNs) with gauge charges ($4$, $4$ and $-5$ respectively) and twoBSM scalars. This is an attractive framework as it can accommodate a keV scaledark matter, with the lightest RHN being the candidate. The remaining two RHNsare quasi-degenerate at the TeV-scale, actively participating in the process ofresonant leptogenesis through their decay governed by the same set of HDOs. TheRHNs being at the TeV scale, make this framework relevant for studying flavoredresonant leptogenesis. This TeV-scale resonant leptogenesis, after satisfyingthe neutrino oscillation data, leads to interesting predictions on the Yukawasector of the model HDOs. The thermal evolution of the baryon asymmetry hasfollowed the experimental results rather accurately in that corner of parameterspace. As a matter of fact, this TeV-scale framework which in principle relieson the low scale resonant leptogenesis typically leads to predictions thatpotentially can be tested at the colliders. In particular, we consider thesame-sign dilepton signature that arises from the RHN pair production throughthe decay of heavy gauge boson of the extra ${\textrm U}(1)$.

Leptogenesis in an anomaly-free $\mathrm{U}(1)$ extension with higher-dimensional operators