Lessons and Prospects from the pMSSM after LHC Run I: Neutralino LSP

TL;DR

This study evaluates the impact of LHC Run I and future high-luminosity runs on the pMSSM with a neutralino LSP, highlighting the potential to discover or constrain natural SUSY models through advanced simulations.

Contribution

It provides a comprehensive analysis of the pMSSM parameter space using fast Monte Carlo simulations, assessing current constraints and future prospects at the LHC.

Findings

Natural SUSY models with light squarks and gluinos remain viable.

High-luminosity LHC will significantly improve sensitivity to neutralino LSP SUSY.

Current LHC data constrains but does not exclude key regions of the pMSSM.

Abstract

We study SUSY signatures at the 7, 8 and 14 TeV LHC employing the 19-parameter, R-Parity conserving p(henomenological)MSSM, in the scenario with a neutralino LSP. Our results were obtained via a fast Monte Carlo simulation of the ATLAS SUSY analysis suite. The flexibility of this framework allows us to study a wide variety of SUSY phenomena simultaneously and to probe for weak spots in existing SUSY search analyses. We determine the ranges of the sparticle masses that are either disfavored or allowed after the searches with the 7 and 8 TeV data sets are combined. We find that natural SUSY models with light squarks and gluinos remain viable. We extrapolate to 14 TeV with both 300 fb$^{-1}$ and 3 ab$^{-1}$ of integrated luminosity and determine the expected sensitivity of the jets + MET and stop searches to the pMSSM parameter space. We find that the high-luminosity LHC will be powerful in probing SUSY with neutralino LSPs and can provide a more definitive statement on the existence of natural Supersymmetry.