Measuring the Jet Energy Resolution at CMS: A Data-Driven Approach

The Compact Muon Solenoid (CMS) detector at the Large Hadron Collider at CERN is a general-purpose detector designed to study proton-proton collisions at a center-of-mass energy of 14 TeV. Many interesting physics signatures include jets in the final state. Jets are identified by clustering localized energy depositions in the CMS calorimeter detectors. Using a sample of dijet events, we have investigated methods for determining the jet energy resolutions in data as a function of jet's transverse energy and pseudorapidity. Studies demonstrating the validity of these methods using Monte Carlo simulations will be presented.