Implementation of simplified likelihoods in HistFactory for searches for supersymmetry

A procedure for the construction of simplified likelihoods for re-interpretation of ATLAS searches for supersymmetry is presented in this note. The procedure relies on the full analysis likelihood in JSON format and takes into account the full statistical model before building an approximation of the background model. After introducing the procedure for building the simplified likelihood in JSON format, its performance using different computational backends is discussed. Finally, the validity of the simplified likelihood is demonstrated using exemplary ATLAS searches for supersymmetry.