Data-driven determination of the energy scale and resolution of jets reconstructed in the ATLAS calorimeters using dijet and multijet events at $\sqrt{s\ }=8~TeV$

The response of the ATLAS calorimeter to jets is studied using data-driven techniques for proton-proton collisions at $\sqrt{s} = 8~$TeV recorded by ATLAS in 2012. The jet response is studied as a function of jet transverse momentum and pseudorapidity relative to a central reference region by evaluating the transverse momentum balance in dijet events. A new calibration is derived to correct the jet energy scale in data for residual effects not captured by the initial calibration based on simulation. The calibration factors are found to range from 0.96 to 1.02 depending on the pseudorapidity of the jet. The uncertainties on these calibration factors have been significantly reduced compared to previous results; they are typically below $1\,\%$ for central jets rising to $3.5\,\%$ for low transverse momentum jets at high absolute pseudorapidity. The jet energy scale calibration for central jets with high transverse momentum is then determined using events in which an isolated high transverse momentum jet recoils against a system of low transverse momentum jets. The data and simulation are found to agree to better than $1\,\%$ for jets with transverse momentum up to $1.7~$TeV, with an associated uncertainty of less than $1\,\%$. Finally, the jet energy resolution is determined using dijet events as a function of jet transverse momentum and pseudorapidity. In general, it is found that the jet energy resolution in data is well reproduced in the simulation.