Search for squarks and gluinos using final states with jets and missing transverse momentum with the ATLAS detector in sqrt(s) = 7 TeV proton-proton collisions

TL;DR

This paper reports a search for squarks and gluinos in proton-proton collisions at 7 TeV using the ATLAS detector, finding no evidence of supersymmetry and setting new exclusion limits on their masses.

Contribution

First search for squarks and gluinos with jets and missing transverse momentum at 7 TeV, establishing new mass exclusion limits in simplified and MSUGRA/CMSSM models.

Findings

Excluded gluino masses below 700 GeV and squark masses below 875 GeV in simplified models.

Excluded squarks and gluinos below 950 GeV in MSUGRA/CMSSM models.

No excess above Standard Model background observed.

Abstract

A search for squarks and gluinos in events containing jets, missing transverse momentum and no electrons or muons is presented. The data were recorded in 2011 by the ATLAS experiment in sqrt(s) = 7 TeV proton-proton collisions at the Large Hadron Collider. No excess above the Standard Model background expectation is observed in 1.04 fb^-1 of data. Gluino and squark masses below 700 GeV and 875 GeV respectively are excluded at the 95% confidence level in simplified models containing only squarks of the first two generations, a gluino octet and a massless neutralino. The exclusion limit increases to 1075 GeV for squarks and gluinos of equal mass. In MSUGRA/CMSSM models with tan(beta)=10, A_0=0 and mu> 0, squarks and gluinos of equal mass are excluded for masses below 950 GeV. These limits extend the region of supersymmetric parameter space excluded by previous measurements.