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The jet energy scale, jet energy resolution, and their systematicuncertainties are measured for jets reconstructed with the ATLAS detector in2012 using proton-proton data produced at a centre-of-mass energy of 8 TeV withan integrated luminosity of 20 fb$^{-1}$. Jets are reconstructed from clustersof energy depositions in the ATLAS calorimeters using the anti-$k_t$ algorithm.A jet calibration scheme is applied in multiple steps, each addressing specificeffects including mitigation of contributions from additional proton-protoncollisions, loss of energy in dead material, calorimeter non-compensation,angular biases and other global jet effects. The final calibration step usesseveral \textit{in situ} techniques and corrects for residual effects notcaptured by the initial calibration. These analyses measure both the jet energyscale and resolution by exploiting the transverse momentum balance in$\gamma$+jet, $Z$+jet, dijet, and multijet events. A statistical combination ofthese measurements is performed. In the central detector region, the derivedcalibration has a precision better than 1% for jets with transverse momentum150 GeV $< p_{\mathrm{T}}<$ 1500 GeV, and the relative energy resolution is$(8.4\pm 0.6)$% for $p_{\mathrm{T}}=$ 100 GeV and $(23\pm 2)$% for$p_{\mathrm{T}}=$ 20 GeV. The calibration scheme for jets with radius parameter$R=1.0$, for which jets receive a dedicated calibration of the jet mass, isalso discussed.

Determination of jet calibration and energy resolution in proton-proton collisions at $\sqrt{s}$ = 8 TeV using the ATLAS detector