$E/p$ Performance for Charged Hadrons

The precise measurement of the momentum of hadrons in the tracking detectors, compared to the energy E measured in the calorimeters can provide a validation of the hadronic calibration of the response of the calorimeter to pions at the percent level. The E/p ratio allows the validation of the absolute energy scale calibration over the pseudorapidity range covered by the tracking detectors. Since the selected hadrons are mainly pions, the results obtained for pion response from test beam data are almost directly comparable. The single hadron E/p performances are studied using minimum bias events.