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A measurement of the rapidity and transverse momentum dependence of dijetazimuthal decorrelations is presented, using the quantity $R_{\Delta \phi}$.The quantity $R_{\Delta \phi}$ specifies the fraction of the inclusive dijetevents in which the azimuthal opening angle of the two jets with the highesttransverse momenta is less than a given value of the parameter $\Delta\phi_\mathrm{max}$. The quantity $R_{\Delta \phi}$ is measured inproton--proton collisions at $\sqrt{s}=$8 TeV as a function of the dijetrapidity interval, the event total scalar transverse momentum, and $\Delta\phi_\mathrm{max}$. The measurement uses an event sample corresponding to anintegrated luminosity of 20.2 fb$^{-1}$ collected with the ATLAS detector atthe CERN Large Hadron Collider. Predictions of a perturbative QCD calculationat next-to-leading order in the strong coupling with corrections fornon-perturbative effects are compared to the data. The theoretical predictionsdescribe the data in the whole kinematic region. The data are used to determinethe strong coupling $\alpha_{\mathrm{S}}$ and to study its running for momentumtransfers from 260 GeV to above 1.6 TeV. An analysis that combines data at allmomentum transfers results in $\alpha_{\mathrm{S}}(m_{Z}) =0.1127^{+0.0063}_{-0.0027}$.

physical review. d/physical review. d.

Measurement of dijet azimuthal decorrelations in $pp$ collisions at  $\sqrt{s}=8$ TeV with the ATLAS detector and determination of the strong  coupling