Active and sterile neutrino phenomenology with A 4 based minimal extended seesaw

Das, Pritam (Department of Physics, Tezpur University, Tezpur 784 028, India) ; Mukherjee, Ananya (Department of Physics, Tezpur University, Tezpur 784 028, India) ; Das, Mrinal Kumar (Department of Physics, Tezpur University, Tezpur 784 028, India)

13 March 2019

Abstract: We study a model of neutrino within the framework of minimal extended seesaw (MES), which plays an important role in active and sterile neutrino phenomenology in (3+1) scheme. The A4 flavor symmetry is augmented by additional Z4×Z3 symmetry to constraint the Yukawa Lagrangian of the model. We use non-trivial Dirac mass matrix, with broken μ−τ symmetry, as the origin of leptonic mixing. Interestingly, such structure of mixing naturally leads to the non-zero reactor mixing angle θ13 . Non-degenerate mass structure for right-handed neutrino MR is considered so that we can further extend our study to Leptogenesis. We have also considered three different cases for sterile neutrino mass, MS to check the viability of this model, within the allowed 3 σ bound in this MES framework.

Published in: Nuclear Physics B 941 (2019) 755-779 DOI: 10.1016/j.nuclphysb.2019.02.024