The Same-Sign Dilepton Signature of RPV/MFV SUSY

TL;DR

This paper investigates the same-sign dilepton signature in RPV/MFV SUSY models, re-analyzes CMS data to set bounds on gluino mass, and proposes search optimizations for future LHC runs.

Contribution

It introduces a simplified RPV/MFV SUSY model focusing on stops and gluinos, and suggests improved search strategies for future collider experiments.

Findings

Current gluino mass lower bound is about 800 GeV.

Gluino masses up to 1.4 TeV could be probed at the 14 TeV LHC.

Proposed search optimizations leverage large invariant mass jets from MFV stop decays.

Abstract

The lack of observation of superpartners at the Large Hadron Collider so far has led to a renewed interest in supersymmetric models with R-parity violation (RPV). In particular, imposing the Minimal Flavor Violation (MFV) hypothesis on a general RPV model leads to a realistic and predictive framework. Naturalness suggests that stops and gluinos should appear at or below the TeV mass scale. We consider a simplified model with these two particles and MFV couplings. The model predicts a significant rate of events with same-sign dileptons and b-jets. We re-analyze a recent CMS search in this channel and show that the current lower bound on the gluino mass is about 800 GeV at 95% confidence level, with only a weak dependence on the stop mass as long as the gluino can decay to an on-shell top-stop pair. We also discuss how this search can be further optimized for the RPV/MFV scenario, using the fact that MFV stop decays often result in jets with large invariant mass. With the proposed improvements, we estimate that gluino masses of up to about 1.4 TeV can be probed at the 14 TeV LHC with a 100 fb^-1 data set.