Same-sign trileptons and four-leptons as signatures of new physics at the Large Hadron Collider

TL;DR

This paper highlights the potential of same-sign multilepton events, especially trileptons and four-leptons, as promising signatures for discovering new physics phenomena at the LHC, including supersymmetry and Little Higgs models.

Contribution

It demonstrates the usefulness of same-sign multilepton signals for new physics searches and assesses their viability at LHC energies, emphasizing their low background and distinctive signatures.

Findings

Same-sign trilepton signals are viable for R-parity breaking supersymmetry at 7 and 14 TeV.

Same-sign four-lepton events can have significant production rates.

Such signals can also arise in Little Higgs theories with T-parity breaking.

Abstract

We point out that same-sign multilepton events, not given due attention yet for new physics search, can be extremely useful at the Large Hadron Collider. After showing the easy reducibility of the standard model backgrounds, we demonstrate the viability of same-sign trilepton signals for R-parity breaking supersymmetry, at both 7 and 14 TeV. We find that same-sign four-leptons, too, can have appreciable rates. Same-sign trileptons are also expected, for example, in Little Higgs theories with T-parity broken by anomaly terms.