Baryogenesis from Hierarchical Dirac Neutrinos

Abstract

We present here a novel and testable mechanism for leptogenesis, which is characterized by a purely thermal generation of lepton asymmetry via scalar decay. Guided by the thermal mass matrix diagonalization in the finite-temperature regime, we propose a scenario in which the baryon asymmetry is formulated in terms of the masses and mixing from hierarchical Dirac neutrinos, as well as a vacuum scale accountable for the sub-eV neutrino masses. This allows a natural and direct link between the high-scale \textit{CP} asymmetry and the low-energy Dirac \textit{CP}-violating phase without involved model structures, and thus circumvents the haunting problem encountered in general leptogenesis scenarios. The mechanism can also be applied as a prototype for solving the baryon asymmetry problem to a broad class of well-motivated model buildings.

6 pages, 2 figures; more discussions and references added, final version published in the journal

References in corpus (5)

• Neutrino Mass and Baryon Asymmetry from Dirac Seesaw
• Medium corrections to the CP-violating parameter in leptogenesis
• Dirac Neutrinos, Dark Energy and Baryon Asymmetry
• Bridging resonant leptogenesis and low-energy CP violation with an RGE-modified seesaw relation
• A direct link between unflavored leptogenesis and low-energy CP violation via the one-loop quantum corrections

Cited by in corpus (3)

• Effective neutrino number shift from keV-vacuum neutrinophilic 2HDM
• Linking the $R_{K^{(\ast )}}$ anomalies to the Hubble tension via a single right-handed neutrino
• Scattering versus Forbidden Decay in Dark Matter Freeze-in