Single hadron response measurements in ATLAS and evaluation of the uncertainty on the jet energy measurement

Single hadron response measurements in minimum bias proton-proton collisions at a center of mass energy of $\sqrt{s}=$ 7 TeV are presented. Together with test-beam results, these measurements form the basis to evaluate the calorimeter response uncertainty of jets at high transverse momenta. A novel technique to evaluate the jet response uncertainty from the single particle response is presented. The agreement between data and Monte Carlo simulation is found to be on the level of a few percent. Finally, it is discussed how the jet calorimeter response uncertainty and its correlation between transverse momentum bins is determined from these measurements.