A model for lepton flavor violating non-standard neutrino interactions

TL;DR

This paper introduces a new model for neutrino non-standard interactions that allows arbitrary ratios of lepton flavor violating to conserving couplings, predicting observable phenomena like Higgs and meson decays, and muon-to-electron conversion.

Contribution

The model uniquely permits arbitrary ratios of LFV to flavor-conserving NSI couplings, expanding phenomenological predictions beyond previous models.

Findings

Predicts invisible Higgs decay modes.

Forecasts new meson decay channels.

Estimates muon-to-electron conversion rates.

Abstract

We present a model for Lepton Flavor Violating (LFV) neutral current non-standard interactions of neutrinos with matter fields parameterized by $\epsilon_{\alpha \beta}^f$ with $\alpha \ne \beta$. Here, unlike the previous models, the ratios of the off-diagonal LFV elements of the effective NSI coupling to the diagonal lepton flavor conserving ones ({\it i.e.,} $(\epsilon_{\alpha \beta}^f)^2/(\epsilon_{\alpha \alpha}^f \epsilon_{\beta \beta}^f)$ ) are arbitrary. The model enjoys rich phenomenology, predicting invisible Higgs decay and new meson decay modes observable in upcoming experiments. The model for $\epsilon_{\mu e}^f$ also predicts a $\mu^-$ to $e^-$ conversion rate on nuclei accessible in the planned experiments.