Dirac-Phase Thermal Leptogenesis in the extended Type-I Seesaw Model

Abstract

Motivated by the fact that the Dirac phase in the PMNS matrix is the only CP-violating parameter in the leptonic sector that can be measured in neutrino oscillation experiments, we examine the possibility that it is the dominant source of CP violation for leptogenesis caused by the out-of-equilibrium decays of heavy singlet fermions. We do so within a low-scale extended type-I seesaw model, featuring two Standard Model singlet fermions per family, in which lepton number is approximately conserved such that the heavy singlet neutrinos are pseudo-Dirac. We find that this produces a predictive model of leptogenesis. Our results show that for low-scale thermal leptogenesis, a pure inverse-seesaw scenario fails to produce the required asymmetry, even accounting for resonance effects, because wash-out processes are too efficient. Dirac-phase leptogenesis is, however, possible when the linear seesaw term is switched on, with the aid of the resonance contributions naturally present in the model. Degenerate and hierarchical spectra are considered -- both can achieve Dirac-phase leptogenesis, although the latter is more constrained. Finally, although unable to probe the parameter space of Dirac-phase leptogenesis, the contributions to unitarity violation of the PMNS matrix, collider constraints and charged-lepton flavour-violating processes are calculated and we further estimate the impact of the future experiments MEG-II and COMET for such models.

v3: Minor corrections and citations added to match published version

References in corpus (18)

• Updated fit to three neutrino mixing: exploring the accelerator-reactor complementarity
• Leptogenesis and Low Energy CP Violation in Neutrino Physics
• Sterile neutrino searches at future $e^{-}{e}^{+}$, $pp$, and $e^{-}p$ colliders
• Connecting Low Energy Leptonic CP-violation to Leptogenesis
• Flavour Covariant Transport Equations: an Application to Resonant Leptogenesis
• Direct Bounds on Electroweak Scale Pseudo-Dirac Neutrinos from $\sqrt{s}=8$ TeV LHC Data
• Lepton flavor violation in low-scale seesaw models: SUSY and non-SUSY contributions
• Lepton Flavour Violation and theta(13) in Minimal Resonant Leptogenesis
• Kadanoff-Baym Approach to Flavour Mixing and Oscillations in Resonant Leptogenesis
• Leptogenesis with TeV Scale Inverse Seesaw in SO(10)
• Full Boltzmann equations for leptogenesis including scattering
• Generation of radiative neutrino mass in the linear seesaw framework, charged lepton flavor violation and dark matter
• Leptogenesis with Linear, Inverse or Double Seesaw
• Sterile Neutrino Dark Matter and Low Scale Leptogenesis from a Charged Scalar
• Minimal Dynamical Inverse See Saw
• Viability of Dirac phase leptogenesis
• Neutrinos with a linear seesaw mechanism in a scenario of gauged B-L symmetry
• The MEGII detector

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