A search for squarks and gluinos in ﬁnal states containing high-pT jets, missing transverse momentum and no electrons or muons is presented. The data were recorded in 2012 by the ATLAS experiment in √s = 8TeV proton-proton collisions at the Large Hadron Collider, with a total integrated luminosity of 20.3fb^−1. Results are interpreted in a variety of simpliﬁed and speciﬁc supersymmetry-breaking models assuming that R-parity is conserved and that the lightest neutralino is the lightest supersymmetric particle. An exclusion limit at the 95% conﬁdence level on the mass of the gluino is set at 1330 GeV for a simpliﬁed model incorporating only a gluino and the lightest neutralino. For a simpliﬁed model involving the strong production of ﬁrst- and second-generation squarks, squark masses below 850GeV (440GeV) are excluded for a massless lightest neutralino, assuming mass degenerate (single light-ﬂavour) squarks. In mSUGRA/CMSSM models with tanβ = 30, A0 = −2m0 and µ > 0, squarks and gluinos of equal mass are excluded for masses below 1700 GeV. Additional limits are set for non-universal Higgs mass models with gaugino mediation and for simpliﬁed models involving the pair production of gluinos, each decaying to a top squark and a top quark, with the top squark decaying to a charm quark and a neutralino. These limits extend the region of supersymmetric parameter space excluded by previous searches with the ATLAS detector.
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