Phenomenological constraints on minimally coupled exotic lepton triplets

TL;DR

This paper investigates the effects of exotic lepton triplets with nonzero hypercharge on lepton flavor violating processes and magnetic moments, deriving constraints from current experimental data.

Contribution

It introduces a model with new triplet leptons and analyzes their impact on flavor-changing processes and magnetic moments, providing new phenomenological constraints.

Findings

Constraints on exotic triplet parameters from experimental data

Predictions for lepton flavor violating decay rates

Calculations of contributions to anomalous magnetic moments

Abstract

By introducing a set of new triplet leptons (with nonzero hypercharge) that can Yukawa couple to their Standard Model counterparts, new sources of tree-level flavor changing currents are induced via mixing. In this work, we study some of the consequences of such new contributions on processes such as the leptonic decays of gauge bosons, $\ell \rightarrow 3\ell'$ and $\ell \rightarrow \ell' \gamma$ which violate lepton flavor, and mu-e conversion in atomic nuclei. Constraints are then placed on the parameters associated with the exotic triplets by invoking the current low-energy experimental data. Moreover, the new physics contribution to the lepton anomalous magnetic moments is calculated.