Search for stealth supersymmetry in events with jets, either photons or leptons, and low missing transverse momentum in pp collisions at 8 TeV

TL;DR

This paper reports a search for stealth supersymmetry in proton-proton collision data at 8 TeV, focusing on events with jets, photons or leptons, and low missing transverse momentum, but finds no evidence of new physics.

Contribution

It introduces a search strategy targeting stealth SUSY models with low missing energy, setting new limits on squark pair production in this framework.

Findings

No excess over standard model predictions was observed.

Limits were set on squark pair production in stealth SUSY models.

The analysis constrains the parameter space of stealth SUSY scenarios.

Abstract

The results of a search for new physics in final states with jets, either photons or leptons, and low missing transverse momentum are reported. The study is based on a sample of proton-proton collisions collected at center-of-mass energy sqrt(s) = 8 TeV with the CMS detector in 2012. The integrated luminosity of the sample is 19.7 inverse femtobarns. Many models of new physics predict the production of events with jets, electroweak gauge bosons, and little or no missing transverse momentum. Examples include stealth models of supersymmetry (SUSY), which predict a hidden sector at the electroweak energy scale in which SUSY is approximately conserved. The data are used to search for stealth SUSY signatures in final states with either two photons or an oppositely charged electron and muon. No excess is observed with respect to the standard model expectation, and the results are used to set limits on squark pair production in the stealth SUSY framework.