In situ jet pseudorapidity intercalibration of the ATLAS detector using dijet events in sqrt{s}=7 TeV proton-proton 2011 data

The response of the ATLAS calorimeters to jets is studied by balancing the transverse momenta of dijets in proton-proton collisions at $sqrt{s}=7$~TeV using a data set corresponding to an integrated luminosity of 4.5~fb$^{-1}$. The results indicate that the pseudorapidity dependence of the jet response is well understood for high $p_{ m T}^{}$ jets across the full calorimeter range. A calibration is derived to correct the jets in data for residual effects not captured by the inital Monte Carlo derived calibration. For jets with $pt>40$~GeV, the uncertainty on this calibration is less than 1% for all jets with $|etaDet|<1.0$ and less than 2.5% for jets with $|etaDet|<2.8$. The uncertainty is the largest for low pt{} jets in the very forward region $|etaDet|>3.2$, for which the uncertainty can be as large as 5.5%.