Leptogenesis and neutrino mass with one right-handed neutrino and Higgs inflaton
Disha Bandyopadhyay (Department of Physics, Indian Institute of Technology Guwahati, Assam 781039, India)
; Debasish Borah (Department of Physics, Indian Institute of Technology Guwahati, Assam 781039, India, Pittsburgh Particle Physics, Astrophysics, and Cosmology Center, Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA); Suruj Jyoti Das (Particle Theory and Cosmology Group, Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS), Daejeon 34126, Korea); Nobuchika Okada (Department of Physics, University of Alabama, Tuscaloosa, Alabama 35487, USA)
We propose a novel and minimal setup where the observed baryon asymmetry of the Universe and neutrino oscillation data can be satisfied with only one right-handed neutrino and a second Higgs doublet with the latter being also responsible for driving cosmic inflation. While inflation is realized via nonminimal coupling of the Higgs to gravity, baryon asymmetry is generated via Affleck-Dine leptogenesis. Due to the presence of only two new fields beyond the standard model (BSM), the proposed setup remains very predictive with only a small allowed parameter space consistent with the PLANCK 2018 and ACT 2025 data simultaneously. The preferred mass spectrum of the BSM particles also keeps the detection prospects alive at terrestrial experiments.
