Jet energy resolution and selection efficiency relative to track jets from in-situ techniques with the ATLAS Detector Using Proton-Proton Collisions at a Center of Mass Energy $sqrt{s}$ = 7 TeV

A first in-situ measurement of the jet energy resolution and selection efficiency relative to track jets using a sample of proton-proton collisions at a center-of-mass energy of √s = 7 TeV is presented. Jets are reconstructed from energy deposits measured by the calorimeters and calibrated using a correction that depends on the jet transverse momentum and pseudorapidity. Results are presented for the anti-kT jet algorithm with distance parameter R = 0.6. The jet resolution is measured with two different methods: the di-jet balance and the bisector techniques. For each of the two methods, the results from applying them to data and Monte Carlo are found to agree within 14% for jets with |y| < 2.8. The calorimeter jet reconstruction and selection efficiency relative to track jets is determined in data and Monte Carlo using a tag and probe technique and found to be in good agreement.