Abstract
A search for squarks and gluinos in final states containing jets, missing transverse momentum and no high-pT electrons or muons is presented. The data represent the complete sample recorded in 2011 by the ATLAS experiment in 7 TeV proton-proton collisions at the Large Hadron Collider, with a total integrated luminosity of 4.7 fb^-1. No excess above the Standard Model background expectation is observed. Gluino masses below 860 GeV and squark masses below 1320 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, for squark or gluino masses below 2 TeV, respectively. Squarks and gluinos with equal masses below 1410 GeV are excluded. 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 1360 GeV. Constraints are also placed on the parameter space of SUSY models with compressed spectra. These limits considerably extend the region of supersymmetric parameter space excluded by previous measurements with the ATLAS detector.
Highlights
Many extensions of the Standard Model (SM) include heavy colored particles, some of which could be accessible at the Large Hadron Collider (LHC) [1]
The measurement of the missing transverse momentum two-vector P~Tmiss is based on the transverse momenta of all remaining jet and lepton candidates and all calorimeter clusters not associated with such objects
This paper reports a search for supersymmetry in final states containing high-pT jets, missing transverse momentum and no electrons with pT > 20 GeV or muons with pT > 10 GeVp.ffiDffi ata recorded by the ATLAS experiment at the LHC at s 1⁄4 7 TeV corresponding to an integrated luminosity of 4:7 fbÀ1 have been used
Summary
Many extensions of the Standard Model (SM) include heavy colored particles, some of which could be accessible at the Large Hadron Collider (LHC) [1]. This paper presents a new ATLAS search for squarks and gluinos in final states containing only jets and large missing transverse momentum. Interest in this final state is motivated by the large number of R-parity conserving models, including minimal supergravity (MSUGRA)/constrained minimal supersymmetric. The search strategy is optimized for maximum discovery reach in the ðmg~; mq~Þ plane (where mg~, mq~ are the gluino and squark masses, respectively) for a range of models This includes a simplified model in which all other supersymmetric particles, except for the lightest neutralino, are given masses beyond the reach of the LHC.
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