Radiative Generation of Neutrino Masses and its Experimental Signals

TL;DR

This paper introduces a new TeV-scale leptoquark model that naturally generates neutrino masses via two-loop diagrams, predicts observable experimental signals at colliders and in rare decay processes, and addresses anomalies in muon g-2 and B_s mixing.

Contribution

A novel two-loop leptoquark model that links neutrino mass generation with testable collider and flavor physics signals, including explanations for muon g-2 and B_s anomalies.

Findings

Neutrino oscillation parameter  predicted near current experimental limit

Leptoquarks accessible at LHC with masses below 1.5 TeV

Enhanced rates for , , and mu-e conversion processes

Abstract

Tiny neutrino masses can arise naturally via loop diagrams. After a brief review of the radiative mass generation mechanism, I present a new model wherein TeV scale leptoquark scalars induce neutrino masses via two--loop diagrams. This model predicts the neutrino oscillation parameter \sin^2\theta_{13} to be close to the current experimental limit. The leptoquarks are accessible to experiments at the LHC since their masses must lie below 1.5 TeV, and their decay branching ratios probe neutrino oscillation parameters. Rare lepton flavor violating processes mediated by leptoquarks have an interesting pattern: mu --> e gamma may be suppressed, while mu --> 3 e and mu-e conversion in nuclei are within reach of the next generation experiments. Muon g-2 receives new positive contributions, which can resolve the discrepancy between theory and experiment. New CP violating contributions to B_s- \B_s-bar mixing via leptoquark box diagrams are in a range that can explain the recently reported dimuon anomaly by the D0 collaboration.