Neutrino masses and mixing angles from leptoquark interactions

TL;DR

This paper proposes a mechanism where leptoquark mixing generates neutrino masses via one-loop diagrams, linking neutrino oscillation data to constraints on leptoquark interactions.

Contribution

It introduces a novel way for leptoquark interactions to produce neutrino masses through mixing and provides experimental constraints on these interactions.

Findings

Leptoquark mixing can generate Majorana neutrino masses.

Constraints on leptoquark couplings are derived from neutrino oscillation data.

Comparison with pion decay constraints enhances the analysis.

Abstract

In this paper we show that the mixing between leptoquarks (LQ's) from different $SU(2)_l$ multiplets can generate a non-trivial Majorana mass matrix for neutrinos through one loop self energy diagrams. Such mixing can arise from gauge invariant and renormalizable LQ-Higgs interaction terms after EW symmetry breaking. We use the experimental indication on neutrino oscillation to find constraints on specific combinations of LQ couplings to quark-lepton pairs and to the SM higgs boson. These constraints are compared with the ones from $\pi\to e\bar {\nu}_e$.