Search for Supersymmetry in the 4-lepton final state with the ATLAS detector

TL;DR

This study searches for supersymmetry in four-lepton final states using ATLAS data from 8 TeV collisions, aiming to detect signals from R-Parity conserving or violating SUSY models with enhanced tau lepton sensitivity.

Contribution

It presents the first comprehensive search for SUSY in four-lepton events at the LHC, including tau leptons, covering both R-Parity conserving and violating scenarios.

Findings

No significant excess observed over the standard model.

Set limits on SUSY particle masses and decay scenarios.

Enhanced sensitivity to tau-enriched SUSY models.

Abstract

The four-lepton final state, rare in standard model processes, is an attractive channel for new physics searches at the LHC. In supersymmetry (SUSY), charged leptons may arise from R-Parity conserving (RPC) cascade decays of SUSY particles to the lightest supersymmetric particle, or from R-Parity violating (RPV) decays to standard model particles. This paper presents a search for supersymmetry in events with at least four charged leptons carried out using 20.3 $\text{fb}^{-1}$ of proton-proton collision data taken with the ATLAS detector at $\sqrt{s} =$ 8 TeV during the 2012 LHC run. Up to two of the leptons may be hadronically decaying tau leptons, enhancing the sensitivity to tau-enriched scenarios. A high sensitivity to a wide range of R-Parity conserving and violating supersymmetric models is achieved.