Stau LSP Phenomenology: Two- versus Four-Body Decay Modes and Resonant Single Slepton Production at the LHC as an Example

TL;DR

This paper explores the decay modes of the lightest scalar tau in B3 mSUGRA models with R-parity violation, analyzing collider signatures and single slepton production at the LHC, including like-sign dimuons and multi-muon final states.

Contribution

It provides a detailed classification of stau_1 decay modes and their dependence on model parameters, and demonstrates the potential for observing single slepton production at the LHC.

Findings

Distinct collider signatures from stau_1 decays are identified.

Single smuon production can lead to like-sign dimuon events.

Analysis of multi-muon final states enhances detection prospects.

Abstract

We investigate B3 mSUGRA models, where the lightest scalar tau, stau_1, is the LSP. B3 models allow for lepton number and R-parity violation; the LSP can thus decay. We assume one non-zero B3 coupling lambda'_ijk at M_GUT, which generates further B3 couplings at M_Z. We study the RGEs and give numerical examples. The new couplings lead to additional stau_1 decays, providing distinct collider signatures. We classify the stau_1 decays and describe their dependence on the mSUGRA parameters. We exploit our results for single slepton production at the LHC. As an explicit numerical example, we investigate single smuon production, focussing on like-sign dimuons in the final state. Also considered are final states with three or four muons.