Jet energy measurement and systematic uncertainties using tracks for jets and for b-quark jets produced in proton-proton collisions at $\sqrt{s} = 7$ TeV in the ATLAS detector

Studies of the jet energy scale are performed in an inclusive QCD jet sample with and without b-tagging and in a sample of top quark pairs, using in situ methods and Monte Carlo simulated samples. The correlation between the calorimeter jet transverse momentum ($p_T$) and the total transverse momentum of tracks pointing to the jet is used to study the calorimeter jet energy scale. Agreement in this correlation is found between Monte Carlo simulation and data for jets tagged as b-jets as well as for samples enriched in light jets within systematic uncertainties of about 4%. Many systematic effects cancel in the ratio of the $p_T$ measurement for b-tagged jets to the measurement for light jets, resulting in a reduced systematic uncertainty of about 2% on the ratio between the b-jet and light-jet energy scales. The $p_T$ imbalance in the dijet system is used to validate the modeling of the neutrino energy carried by b-jets decaying semileptonically to a muon and a neutrino. Agreement between data and Monte Carlo simulation is found, within the 2% uncertainty of the method.