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, setting new limits on their masses due to no observed excess over Standard Model predictions.

Contribution

First to set experimental mass limits on squarks and gluinos in 7 TeV proton-proton collisions with the ATLAS detector.

Findings

Gluino masses below 500 GeV are excluded in simplified models.

Gluino and squark masses below 870 GeV are excluded for equal masses.

Most stringent limits to date on squark and gluino masses in these models.

Abstract

A search for squarks and gluinos in final states containing jets, missing transverse momentum and no electrons or muons is presented. The data were recorded 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 was observed in 35 inverse picobarns of analysed data. Gluino masses below 500 GeV 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 increases to 870 GeV for equal mass squarks and gluinos. In MSUGRA/CMSSM models with tan(beta)= 3, A_0=0 and mu>0, squarks and gluinos of equal mass are excluded below 775 GeV. These are the most stringent limits to date.