One colorful resolution to the neutrino mass generation, three lepton flavor universality anomalies, and the Cabibbo angle anomaly

Abstract

We propose a simple model to simultaneously explain four observed flavor anomalies while generating the neutrino mass at the one-loop level. Specifically, we address the measured anomalous magnetic dipole moments of the muon, ∆aμ, and electron, ∆ae, the observed anomaly of b → sl+l− in the B-meson decays, and the Cabibbo-angle anomaly. The model consists of four colorful new degrees of freedom: three scalar leptoquarks with the Standard Model quantum numbers (3, 3, −1/3), (3, 2, 1/6), and (3, 1, 2/3), and one pair of down-quark-like vector fermion in (3, 1, −1/3). The baryon number is assumed to be conserved for simplicity.Phenomenologically viable solutions with the minimal number of real parameters can be found to accommodate all the above-mentioned anomalies and produce the approximate, close to 1σ, neutrino oscillation pattern at the same time. From general consideration, the model robustly predicts: (1) neutrino mass is of the normal hierarchy type, and (2) $$ {\mathcal{M}}_{ee}^{\nu } $$ M ee ν ≲ 3 × 10−4 MeV.The possible UV origin to explain the flavor pattern of the found viable parameter space is briefly discussed. The parameter space can be well reproduced within a simple split fermion toy model.

Probing Neutrino Mass Models through Resonances at Neutrino Telescopes

“…While we focus primarily on the Zee model [3] of radiative neutrino mass and its leptoquark variants [8,9], our analysis is more general and is applicable to a variety of radiative neutrino mass models which could potentially lead to observable signals at IceCube. This includes one-loop [3,8], two-loop [5,6] and three-loop [7,20,21] radiative models with color neutral scalars, as well as one-loop [8,[22][23][24][25][26][27][28][29], two-loop [30][31][32][33], and three-loop [34] radiative neutrino mass models utilizing leptoquarks with or without color neutral scalars.…”