In-situ probe of the response of the Tile Calorimeter to isolated hadrons

The Tile calorimeter is the hadronic central barrel of the calorimeter system of the ATLAS experiment for the LHC at CERN. It is based on a sampling technique where scintillating tiles are embedded in iron absorber plates. The tiles are grouped together in cells which are disposed in three different layers. The cells from the two innermost layers cover a ∆η×∆φ range of 0.1×0.1, while the outermost layer covers 0.2×0.1. An in-situ method to probe the calorimeter response to single charged hadrons can be established by using the ratio of energy measured in the calorimeter cells over the momentum measured by the inner tracking system. This measurement can be used to place constraints on the systematic uncertainty for the jet and tau energy scales. Results from pp collision data from 2010 and 2011 will be shown and discussed as a function of different layer and barrel section. Finally, comparison to MC simulation will prove the good performance of the detector.