Reinterpretation of searches for supersymmetry in models with variable R-parity-violating coupling strength using the full ATLAS Run 2 Dataset

TL;DR

This paper reinterprets 13 ATLAS SUSY searches with the full Run 2 dataset to set new limits on supersymmetric particle masses across models with variable R-parity-violating couplings, enhancing sensitivity to long-lived particles.

Contribution

It extends previous SUSY searches to models with variable RPV couplings, providing new mass limits and exploring long-lived particle signatures with improved sensitivity.

Findings

Gluino mass limits up to 1.8 TeV regardless of RPV coupling.

Exclusion of gluino masses up to 2.2 TeV for certain RPV couplings.

Tau-slepton masses between 180 and 340 GeV are excluded for small RPV couplings.

Abstract

A collection of thirteen ATLAS searches for supersymmetry (SUSY) models, optimized for R-parity-conserving (RPC) and R-parity-violating (RPV) SUSY, are reinterpreted in SUSY models with variable RPV coupling strength, which determines whether the lightest supersymmetric particle decays promptly or is long-lived. The dataset corresponds to an integrated luminosity of 140 fb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV collected between 2015 and 2018 by the ATLAS detector at the Large Hadron Collider. Limits are set at 95% confidence level on the mass of pair-produced gluinos decaying to final states enhanced or depleted with top quarks, and on the masses of pair-produced top squarks, tau-sleptons, or charginos and neutralinos. In a model of pair-produced gluinos decaying to final states enhanced with top quarks, a lower limit of 1.8 TeV on the gluino mass is set regardless of the RPV coupling value. In the gluino model with decays to first and second generation quarks, gluino masses are excluded up to 1.6-2.2 (1.6-2.5) TeV for different values of the RPV coupling $\lambda^{'}$ ($\lambda^{''}$). Top-squark masses up to 2.4 TeV are excluded at high values of $\lambda^{''}$, compared to 1.0-1.7 TeV for low and intermediate $\lambda^{''}$. Tau-slepton masses between 180 GeV and 340 GeV are excluded for $\lambda$ couplings smaller than $10^{-4}$. Higgsino masses up to 800 GeV-1.0 TeV are excluded when $\lambda_{i33}$ is larger than $4\times10^{-5}$. This work extends the analyses beyond RPC scenarios to a broad class of RPV frameworks and achieves significantly improved sensitivity to a diverse range of long-lived particle signatures.