Possible Discovery Channel for New Charged Leptons at the LHC

TL;DR

This paper proposes a new, nearly background-free detection channel for discovering charged leptons at the LHC, using three same-sign leptons in the final state, applicable to certain beyond Standard Model theories.

Contribution

It introduces a novel detection channel with three same-sign leptons for discovering new charged leptons at the LHC, applicable to four-family Standard Model and E6 GUT models.

Findings

Approximately 8 signal events expected at 14 TeV with 1 fb^-1.

Channel is practically backgroundless.

Potential for discovery through counting experiment.

Abstract

We propose a channel for the possible discovery of new charged leptons at the Large Hadron Collider. The proposed final state contains three same-sign leptons, making this new channel practically back- groundless. The method is illustrated for two different cases: the four-family Standard Model and the Grand Unified Theory based on the E6 gauge group. An example study taking 250 GeV as the charged lepton mass shows that in both models, about 8 signal events can be expected at 14 TeV center-of-mass energy with 1 fb^-1 of integrated luminosity. Although the event yield might not be sufficient for detailed measurements of the charged lepton properties, it would be sufficient to claim discovery through a counting experiment.