Phenomenological MSSM interpretation of CMS searches in pp collisions at sqrt(s) = 7 and 8 TeV

TL;DR

This study interprets CMS search results within the phenomenological MSSM framework, using Bayesian analysis to constrain model parameters based on collision data at 7 and 8 TeV, excluding certain supersymmetric particle mass ranges.

Contribution

It provides a comprehensive Bayesian interpretation of CMS supersymmetry searches in the pMSSM, reducing complexity by focusing on 19 key parameters and assessing model viability.

Findings

Approximately half of the pMSSM models are excluded.

All models with gluino mass below 500 GeV are excluded.

Models with chargino and neutralino masses below 200 GeV are disfavored.

Abstract

Searches for new physics by the CMS collaboration are interpreted in the framework of the phenomenological minimal supersymmetric standard model (pMSSM). The data samples used in this study were collected at sqrt(s) = 7 and 8 TeV and have integrated luminosities of 5.0 and 19.5 inverse-femtobarns, respectively. A global Bayesian analysis is performed, incorporating results from a broad range of CMS supersymmetry searches, as well as constraints from other experiments. Because the pMSSM incorporates several well-motivated assumptions that reduce the 120 parameters of the MSSM to just 19 parameters defined at the electroweak scale, it is possible to assess the results of the study in a relatively straightforward way. Approximately half of the model points in a potentially accessible subspace of the pMSSM are excluded, including all pMSSM model points with a gluino mass below 500 GeV, as well as models with a squark mass less than 300 GeV. Models with chargino and neutralino masses below 200 GeV are disfavored, but no mass range of model points can be ruled out based on the analyses considered. The nonexcluded regions in the pMSSM parameter space are characterized in terms of physical processes and key observables, and implications for future searches are discussed.