Phenomenological study of extended seesaw model for light sterile neutrino

Understand

We study the zero textures of the Yukawa matrices in the minimal extended type-I seesaw (MES) model which can give rise to $\sim$ eV scale sterile neutrinos.

• In this model, three right handed neutrinos and one extra singlet $S$ are added to generate a light sterile neutrino.
• The light neutrino mass matrix for the active neutrinos, $ m_{\nu}$, depends on the Dirac neutrino mass matrix ($ M_{D} $), Majorana neutrino mass matrix ($ M_{R} $) and the mass matrix ($ M_{S} $) coupling the right handed neutrinos and the singlet.
• The model predicts one of the light neutrino masses to vanish.