Single-Particle Response in the CMS Calorimeters

The single-particle response in the prototype CMS calorimeters has been measured in a test beam environment using hadron beams over a large range of energy and the data were used to tune the CMS simulation software. Strategies for measuring single-particle response from collision data at the Large Hadron Collider have been developed using isolated charged hadrons. The criteria to select isolated charged particles are optimized in order to maximize the signal containment, while minimizing contamination from other sources. Response functions are determined for the final detector configuration, which includes effects from additional dead material not present in the test beam environment, using collision data with the center of mass energy of 7 TeV. These measurements are compared with Monte Carlo predictions tuned to the test beam data.