Probing Leptonic Interactions of a Family-Nonuniversal Z' Boson

TL;DR

This paper investigates a family-nonuniversal Z' boson with leptonic couplings, analyzing its mixing effects and deriving constraints from experimental data to guide future searches.

Contribution

It provides a comprehensive, model-independent analysis of leptonic Z' couplings, including mixing effects, and establishes the most stringent bounds from current experiments.

Findings

Stringent bounds on leptonic Z' couplings derived from experimental data.

Predictions for future experimental probes of Z' interactions.

Analysis includes effects of kinetic and mass mixing on Z' phenomenology.

Abstract

We explore a Z' boson with family-nonuniversal couplings to charged leptons. The general effect of Z-Z' mixing, of both kinetic and mass types, is included in the analysis. Adopting a model-independent approach, we perform a comprehensive study of constraints on the leptonic Z' couplings from currently available experimental data on a number of flavor-conserving and flavor-changing transitions. Detailed comparisons are made to extract the most stringent bounds on the leptonic couplings. Such information is fed into predictions of various processes that may be experimentally probed in the near future.