A measurement of single hadron response using data at $\sqrt{s}$ = 8 TeV with the ATLAS detector

A measurement of the calorimeter response to isolated single hadrons is presented. Inclusive hadron response is measured and found to be in reasonable agreement with the detector simulation, once the neutral background has been removed. Displaced particle decays are used to identify several particle species and measure their responses separately. The previous analysis based on 2010 data and an older Geant4 version and hadronic physics description showed consistency in inclusive single-particle response and 20%-level discrepancies in the modeling of anti-proton response at low momenta. These updated studies suggest that anti-proton response at low momenta is now correctly modeled but indicate a new deficit of about 5% in the modeling of pion response in the central portion of the calorimeter.