Testing texture two-zero neutrino mass matrices under current experimental scenario

Department of Physics, M.N.S. Government College Bhiwani - Bhiwani, Haryana, 127021, India

Received: 11 November 2019
Accepted: 21 January 2020

Abstract

The latest data from the Planck Collaboration presented an improved sensitivity limit of the sum of neutrino masses , at 95 confidence level (CL). On the other hand, the updated global fits of neutrino oscillation have shown a refined range of atmospheric mixing angle at the same CL. In the light of these observations, we have re-investigated the five viable cases (B_{1, 2, 3, 4} and C) of the texture two-zero Majorana mass matrix in the flavor basis. Using the present Planck's data, we have demonstrated that only cases B₂ and B₄ are now viable for normal mass ordering, while the remaining three cases do not meet the present experimental constraints at 2σ CL. The phenomenological predictions of the viable cases are also found to be in tune with the latest T2K, Super-Kamiokande and NOνA results, showing the preference for normal neutrino mass ordering (m₁ < m₂ < m₃), a maximal Dirac CP-violating phase , and the upper octant of the neutrino mixing angle . In addition, the implication of Σ on the neutrinoless double beta decay is studied for viable cases.