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

Abstract

We explore an anomaly-free $\text{U}(1)$ gauge extended beyond the Standard model (BSM) framework, to account for the baryon asymmetry of the Universe, along with arranging for tiny neutrino mass. Neutrino masses are generated via higher-dimensional operators (HDOs) involving three right-handed neutrinos (RHNs) with gauge charges ($4$, $4$ and $-5$ respectively) and two BSM scalars. This is an attractive framework as it can accommodate a keV scale dark matter, with the lightest RHN being the candidate. The remaining two RHNs are quasi-degenerate at the TeV-scale, actively participating in the process of resonant leptogenesis through their decay governed by the same set of HDOs. The RHNs being at the TeV scale, make this framework relevant for studying flavored resonant leptogenesis. This TeV-scale resonant leptogenesis, after satisfying the neutrino oscillation data, leads to interesting predictions on the Yukawa sector of the model HDOs. The thermal evolution of the baryon asymmetry has followed the experimental results rather accurately in that corner of parameter space. As a matter of fact, this TeV-scale framework which in principle relies on the low scale resonant leptogenesis typically leads to predictions that potentially can be tested at the colliders. In particular, we consider the same-sign dilepton signature that arises from the RHN pair production through the decay of heavy gauge boson of the extra $\text{U}(1)$.

43 pages, 8 figures, Explanations added, to appear in Nucl. Phys. B

References in corpus (14)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• From the trees to the forest: a review of radiative neutrino mass models
• Search for resonant and nonresonant new phenomena in high-mass dilepton final states at $\sqrt{s}=$ 13 TeV
• Tri-bimaximal Neutrino Mixing and Flavor-dependent Resonant Leptogenesis
• Signatures for right-handed neutrinos at the Large Hadron Collider
• Lepton Flavour Violation and theta(13) in Minimal Resonant Leptogenesis
• Classically conformal U(1)' extended standard model, electroweak vacuum stability, and LHC Run-2 bounds
• The Sphaleron Rate through the Electroweak Cross-over
• The Interplay Between the "Low" and "High" Energy CP-Violation in Leptogenesis
• Vacuum Stability in U(1)-Prime Extensions of the Standard Model with TeV Scale Right Handed Neutrinos
• Corrigendum to "Flavour Covariant Transport Equations: an Application to Resonant Leptogenesis"
• Flavoured Leptogenesis
• Leptogenesis in an extended seesaw model with $U(1{)}_{B-L}$ symmetry
• Reconciling resonant leptogenesis and baryogenesis via neutrino oscillations