Expansion of $U_{PMNS}$ and Neutrino mass matrix $M_{\nu }$ in terms of $sin{\theta }_{13}$ for Inverted Hierarchical case

Abstract

The recent observational data supports the deviation from Tri-bimaximal (TBM) mixings. Different neutrino mass models suggest the interdependency among the observational parameters involving the mixing angles. On phenomenological ground we try to construct the PMNS matrix $U_{PMNS}$ with certain analytic structure satisfying the unitary condition, in terms of a single observational parameter $sin{\theta }_{13}$. We hypothesise the three neutrino masses $m_i$ as functions of $sin{\theta }_{13}$ and then construct the neutrino mass matrix $M_{\nu }$. We assume the convergence of the model to TBM mixing when ${\theta }_{13}$ is taken zero. This mass matrix so far obtained can be employed for various applications including the estimation of matter-antimatter asymmetry of the Universe.

Comments: 9 pages, 5 figures