Search for supersymmetry at √s= 8 TeV in final states with jets and two same-sign leptons or three leptons with the ATLAS detector

A search for strongly produced supersymmetric particles is conducted using
signatures involving multiple energetic jets and either two isolated leptons (e or μ) with the
same electric charge, or at least three isolated leptons. The search also utilises jets originating
from b-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−1 of √s= 8TeV 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.