Abstract
AbstractA search for strongly produced supersymmetric particles is conducted using signatures involving multiple energetic jets and either two isolated leptons (eor μ) with the same electric charge, or at least three isolated leptons. The search also utilises jets originating fromb-quarks, missing transverse momentum and other observables to extend its sensitivity. The analysis uses a data sample corresponding to a total integrated luminosity of 20.3 fb−1of$ \sqrt{s} $= 8 TeV proton-proton collisions recorded with the ATLAS detector at the Large Hadron Collider in 2012. No deviation from the Standard Model expectation is observed. New or significantly improved exclusion limits are set on a wide variety of supersymmetric models in which the lightest squark can be of the first, second or third generations, and in which R-parity can be conserved or violated.
Highlights
Background estimationSearches in SS and 3L events are characterised by low SM backgrounds
SUSY models of particular sensitivity to each signal region are shown for illustration purposes
Diboson production in association with jets is a large source of background for signal regions that do not require the presence of b-jets, namely SR0b, SR3Llow and SR3Lhigh
Summary
ATLAS is a multi-purpose detector [26] designed for the study of pp and heavy-ion collisions at the LHC. It provides nearly full solid angle coverage around the interaction point. Charged particles are tracked by the inner detector, which covers the pseudorapidity region |η| < 2.5. Hadronic calorimeters with scintillating tiles as active material cover |η| < 1.7 while LAr technology is used for hadronic calorimetry from |η| = 1.5 to |η| = 4.9. Three layers of precision gas chambers track muons up to |η| = 2.7 and muon trigger chambers cover the range |η| ¡ 2.4. The data set, after the application of beam, detector and data quality requirements, has an integrated luminosity of 20.3 ± 0.6 fb−1. The number of pp interactions occurring in the same bunch crossing varies between approximately 10 and 30 with an average of 20.7 for this data set
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