Fermion masses and mixings and $g-2$ muon anomaly in a $Q_6$ flavored 2HDM

TL;DR

This paper introduces an extended 2HDM with specific flavor symmetries that explains fermion mass hierarchies, neutrino oscillation data, and the muon g-2 anomaly within a unified framework.

Contribution

It presents a novel 2HDM model with $Q_6\times Z_4\times Z_2$ symmetry that successfully accounts for fermion masses, mixings, neutrino data, and the muon g-2 anomaly.

Findings

Reproduces neutrino mass splittings and mixing angles within experimental limits.

Predicts a feasible range for the leptonic CP phase consistent with data.

Accommodates the muon anomalous magnetic moment within the model.

Abstract

We propose an extended 2HDM with $Q_6\times Z_4\times Z_2$ symmetry that can successfully accommodate the SM fermion mass and mixing hierarchy. The tiny masses of the active neutrinos are generated from a type-I seesaw mechanism mediated by very heavy right-handed Majorana neutrinos. The model gives a natural explanation of the charged lepton mass hierarchy. Besides that, the experimental values of the physical observables of the neutrino sector: the neutrino mass squared splittings, the leptonic mixing angles and the leptonic Dirac CP violating phase, are also successfully reproduced for both normal and inverted neutrino mass hierarchies. We find a feasible range of values for the leptonic Dirac CP phase to be in the ranges $\delta_{CP}\in (305.90, 348.70)^\circ$ for normal ordering and $\delta_{CP}\in (308.00, 348.00)^\circ$ for inverted ordering, which is consistent with the 3$\sigma$ experimentally allowed limits. The sum of neutrino masses is obtained as $\sum m_i \in (58.03, 60.51)$ meV for normal ordering and $\sum m_i\in (98.07, 101.40)$ meV for inverted ordering which are well consistent with all the recent limits. In addition, the obtained ranges for the effective neutrino masses are $\langle m_{ee}\rangle \in (3.80, 4.38)$\, meV, $m_{\beta} \in (8.53, 9.34)\, \mbox{meV}$ for normal ordering and $\langle m_{ee}\rangle \in (47.85, 49.58) $ meV, $m_{\beta} \in (48.39, 50.09)\, \mbox{meV}$ for inverted ordering which are in agreement with the recent experimental bounds. For the quark sector, the derived results are also in agreement with the recent data on the quark masses and mixing angles. The model under consideration can also accommodate the muon anomalous magnetic moment.