Search for Excited Leptons in e+ e- Interactions at sqrt(s)=192 - 202 GeV

TL;DR

This study searches for excited leptons in electron-positron collisions at energies between 192 and 202 GeV using the L3 detector, setting limits on their mass and couplings due to no observed signals.

Contribution

First search for excited leptons at LEP energies, establishing new mass limits and coupling constraints with no evidence of production.

Findings

No evidence of excited lepton production found.

Lower mass limits near the kinematic limit established.

Upper limits on couplings up to 200 GeV derived.

Abstract

Excited leptons are searched for using the L3 detector at LEP. The data collected at centre-of-mass energies in the range from 192 up to 202 GeV correspond to a total luminosity of 233 pb^(-1). No evidence of either pair production of excited leptons, nor of single production is found. From the searches for pair produced excited leptons, lower mass limits close to the kinematic limit are set. From the searches for singly produced excited leptons, upper limits on their couplings are derived in the mass range up to 200 GeV.