Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using √s=8 TeV proton--proton collision data

Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Gallo, Valentina; Haug, Sigve; Kruker, Tobias; Marti, Lukas; Meloni, Federico; Schneider, Basil; Sciacca, Gianfranco; Stramaglia, Maria; Stucci, Stefania Antonia; Weber, Michael (2014). Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using √s=8 TeV proton--proton collision data. Journal of High Energy Physics, 2014(9) Springer 10.1007/JHEP09(2014)176

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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 20.3 fb−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 1330GeV 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
tan β = 30, A0 = −2m0 and μ > 0, squarks and gluinos of equal mass are excluded for
masses below 1700GeV. 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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