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Heavy-quark jets are important in many of today's collider studies andsearches, yet predictions for them are subject to much larger uncertaintiesthan for light jets. This is because of strong enhancements in higher ordersfrom large logarithms, ln(p_t/m_Q). We propose a new definition of heavy-quarkjets, which is free of final-state logarithms to all orders and such that allinitial-state collinear logarithms can be resummed into the heavy-quark partondistributions. Heavy-jet spectra can then be calculated in the masslessapproximation, which is simpler than a massive calculation and reduces thetheoretical uncertainties by a factor of three. This provides the first everaccurate predictions for inclusive b- and c-jets, and the latter havesignificant discriminatory power for the intrinsic charm content of the proton.The techniques introduced here could be used to obtain heavy-flavour jetresults from existing massless next-to-leading order calculations for a widerange of processes. We also discuss the experimental applicability of ourflavoured jet definition.

Accurate QCD predictions for heavy-quark jets at the Tevatron and LHC