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A quantity that promises to reveal important information on perturbative andnon-perturbative QCD dynamics is the azimuthal decorrelation between jets indifferent hard processes. In order to access this information fixed-order NLOpredictions need to be supplemented by resummation of logarithmic terms whichare large in the region where the jets are nearly back-to-back in azimuth. Inthe present letter we carry out this resummation to next-to--leadinglogarithmic accuracy explaining the important role played by the recombinationscheme in general resummations for such jet observables.

Azimuthal decorrelations between QCD jets at all orders