Neutrino mixing matrix and masses at a particular point of the generalized Fridberg-Lee model

TL;DR

This paper modifies the generalized Friedberg-Lee neutrino mass model at a specific point to produce a realistic neutrino mixing matrix with nonzero θ13, inverted mass ordering, and CP violation, aligning with experimental data.

Contribution

It introduces a minimal, rule-based perturbation to the Democratic mass matrix within the generalized Friedberg-Lee model to achieve realistic neutrino mixing parameters.

Findings

Neutrino mixing matrix with nonzero θ13 and CP violation derived

Inverted neutrino mass ordering obtained

Parameter ranges consistent with experimental data

Abstract

We propose the generalized Friedberg-Lee model neutrino mass model at a particular point (point D at which $\alpha=\beta=-\frac{1}{3}$) where at this point, the generalized Fridberg-Lee model is converted to the Democratic mass matrix with the $S_3$ symmetry. The Democratic texture has an experimentally unfavored degenerate mass spectrum on the base of the tribimaximal mixing matrix $(U_{TBM})$. We modify the Democratic mass matrix, at point D, to obtain a nondegenerate mass spectrum by adding the breaking mass term as preserving the twisted Fridberg-Lee symmetry. Although the mixing matrix is still $(U_{TBM})$, where leads to $\theta_{13}=0$ which is not consistent with the results from Daya Bay and RENO experiments that have established a nonzero value for $\theta_{13}$. preserving the leading behavior of $U$ as tribimaximal, and we apply the Broken Democratic neutrino mass texture as a mass matrix at point D. Subsequently, we characterize a minimal perturbation mass matrix which is responsible for a nonzero $\theta_{13}$ along with CP violation parameters, besides the solar neutrino mass splitting has been resulted from it. Let us mention that, unlike other investigations, the perturbation matrix is not adopted on an ad hoc basis, but is generated only in one step by the rules of perturbation method that we will describe. Subsequently, we develop the following results to the literature: (a) we obtain the corresponding neutrino mixing matrix of the generalized Fridberg-Lee model at point D with $\theta_{23}=\frac{\pi}{4}$ and non-zero $\delta$; (b) the ordering of the neutrino masses is inverted; (c) we also obtain the allowed range of the mass parameters, the Dirac phase and the Jarlskog parameter which are consistence with the available experimental data.