2013/03/31 by Debasish Borah, Mrinal Kumar Das · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.90.015006
published as Phys. Rev. D90, 015006 (2014) · Version 3: Major changes to include flavor effects, 25 pages, 47 figures, to appear in Phys. Rev. D. arXiv admin note: text overlap with arXiv:1210.5074
arxiv created 2014/06/23 · openalex publication_date 2014/07/07 · arxiv updated 2014/07/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The baryon to photon ratio in the present Universe is very accurately measured to be (6.065\ifmmode±\else\textpm\fi0.090)\ifmmode×\else\texttimes\fi10^\ensuremath-10. We study the possible origin of this baryon asymmetry in the neutrino sector through the generic mechanism of baryogenesis through leptogenesis. We consider both the type I and type II seesaw origin of neutrino masses within the framework of left-right symmetric models (LRSM). Using the latest best-fit global neutrino oscillation data of mass squared differences, mixing angles and Dirac CP phase, we compute the predictions for baryon to photon ratio keeping the Majorana CP phases as free parameters for two different choices of lightest neutrino mass eigenvalue for both normal and inverted hierarchical patterns of neutrino masses. We do our calculation with and without lepton flavor effects being taken into account. We choose different diagonal Dirac neutrino mass matrix for different flavor effects in such a way that the lightest right-handed neutrino mass is in the appropriate range. We also study the predictions for baryon asymmetry when the neutrino masses arise from a combination of both type I and type II seesaw (with dominating type I term) and discriminate between several combinations of Dirac and Majorana CP phases by demanding successful predictions for baryon asymmetry.