Understanding the masses and mixings of onezero textures in 3+1 scenario
Abstract
We present a detailed analysis and phenomenological consequences of neutrino mass matrix, Mν, with onezero texture in the flavor basis where the active neutrino sector is extended by one sterile neutrino (3+1 case). In particular, our aim is to explore behavior of the sterile mixing parameters in detail when one of the elements of the neutrino mass matrix goes to zero. To study this, we consider two distinct mass spectrum of the active neutrinos: (i) completely hierarchical mass spectrum with a vanishing neutrino mass and (ii) completely quasidegenerate mass spectrum. In 3+1 scenario, the low energy neutrino mass matrix, Mν, is a 4 × 4 matrix and has 10 independent elements. Thus it can have 10 possible onezero textures. From the earlier studies it can be inferred that, if one assumes one vanishing neutrino mass, then only seven of these Mν are phenomenologically allowed by the current neutrino oscillation data. On the other hand, if the neutrinos are quasidegenerate then there are eight phenomenologically viable onezero textures. In this paper, we study the correlations between the sterile mixing parameters for each of these allowed textures for both mass spectrum and also their implications on the effective Majorana mass.
 Publication:

International Journal of Modern Physics A
 Pub Date:
 August 2016
 DOI:
 10.1142/S0217751X16501323
 arXiv:
 arXiv:1512.00635
 Bibcode:
 2016IJMPA..3150132N
 Keywords:

 Neutrino mass matrix;
 sterile neutrinos;
 texture zero;
 14.60.St;
 Nonstandardmodel neutrinos righthanded neutrinos etc.;
 High Energy Physics  Phenomenology
 EPrint:
 18 pages, 9 figures, 2 tables, Version accepted for publication in Int. J. Mod. Phys. A