Bounds on the electromagnetic interactions of excited spin-3/2 leptons

TL;DR

This paper investigates potential deviations from quantum electrodynamics caused by virtual excited spin-3/2 leptons in electron-positron collisions, using OPAL data to set bounds on their properties.

Contribution

It provides new bounds on the mass and coupling strengths of excited spin-3/2 leptons based on experimental data.

Findings

Established bounds on nonstandard-lepton mass

Set limits on coupling strengths

Used OPAL data at 183 GeV

Abstract

We discuss possible deviations from QED produced by a virtual excited spin-3/2 lepton in the reaction $e^+e^- \longrightarrow 2\gamma$. Data recorded by the OPAL Collaboration at a c.m. energy $\sqrt{s} = 183 GeV$ are used to establish bounds on the nonstandard-lepton mass and coupling strengths.