NonzeroUe3,CPviolation, and leptogenesis in a seesaw type softly brokenA4symmetric model

2008/03/31 by Biswajit Adhikary, Ambar Ghosal
Physics and Astronomy · #Anisotropy #Astrophysics and Cosmic Phenomena #CMB cold spot #Cosmic microwave background #Energy (signal processing) #Leptogenesis #Lepton #Neutrino #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #hep-ph

paper · pdf · doi:10.1103/physrevd.78.073007

published as Phys.Rev.D78:073007,2008 · 35 pages, 16 figures, discussion and reference added, version to appear in Phys. Rev. D

arxiv created 2008/09/30 · openalex publication_date 2008/10/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We have shown that nonzero U_e3 is generated in a seesaw type softly broken A₄ symmetric model through a single parameter perturbation in m_D in a single element. We have explored all possible 9 cases to study the neutrino mixing angles considering the best fitted values of \ensuremathΔm_\ensuremath\bigodot² and \ensuremathΔm_atm² with all parameters real. We have extended our analysis for the complex case and demonstrated large low energy CP violation (J_CP\ensuremath≃10^\ensuremath-2) and m_ee in addition to mixing and mass pattern. We have also investigated leptogenesis and for a reasonable choice of model parameters compatible with low energy data, the Wilkinson Microwave Anisotropy Probe (WMAP) value of baryon asymmetry 6\ifmmode×\else\texttimes\fi10^\ensuremath-10 is obtained for right-handed neutrino mass scale M₀\ensuremath≃10¹³ GeV. We have obtained a relation among the phases responsible for leptogenesis and have shown that those phases also have correlations with low energy CP violating phases.

Citations

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