Affiliation:
1. Indian Institute of Technology Kharagpur
2. Indian Institute of Technology Guwahati
Abstract
The hybrid leptogenesis framework combining the type-I and type-II seesaw mechanisms for neutrino mass necessarily include scattering topologies involving both the scalar triplet and the right-handed neutrino. We demonstrate that a systematic inclusion of these mixed scatterings can significantly alter the evolution of the number densities exhibiting, up to a factor ten, deviation in the predicted asymmetry as demonstrated by our benchmark scenarios. We provide quantitative constraints on the degeneracy of the seesaw scales where the complete analysis becomes numerically significant, limiting the validity of leptogenesis being dominated by the lightest seesaw species only.
Published by the American Physical Society
2024
Funder
Ministry of Education, India
Science and Engineering Research Board
Indian Institute of Technology Kharagpur
Ministry of Electronics and Information technology
Department of Science and Technology, Ministry of Science and Technology, India
Publisher
American Physical Society (APS)