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We discuss non-perturbative QCD contributions to jet observables, computingtheir dependence on the jet radius R, and on the colour and transverse momentumof the parton initiating the jet. We show, using analytic QCD models of powercorrections as well as Monte Carlo simulations, that hadronisation correctionsgrow at small values of R, behaving as 1/R, while underlying eventcontributions grow with the jet area as R^2. We highlight the connectionbetween hadronisation corrections to jets and those for event shapes in e^+e^-and DIS; we note the limited dependence of our results on the choice of jetalgorithm; finally, we propose several measurements in the context of which totest or implement our predictions. The results presented here reinforce themotivation for the use of a range of R values, as well as a plurality ofinfrared-safe jet algorithms, in precision jet studies at hadron colliders.

Non-perturbative QCD effects in jets at hadron colliders