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

Heavy-quark jets are important in many of today's collider studies and searches, yet predictions for the m are subject to much larger uncertainties than for light jets. This is because of strong enhancements in higher orders from large logarithms, ln(p(t)/m(Q)). We propose a new definition of heavy-quark jets, which is free of final-state logarithms to all orders and such that all initial-state collinear logarithms can be resummed into the heavy-quark parton distributions. Heavy-jet spectra can then be calculated in the mass less approximation, which is simpler than a massive calculation and reduces the theoretical uncertain ties by a factor of three. This provides the first ever accurate predictions for inclusive b-and c-jets,and the latter have significant discriminatory power for the intrinsic charm content of the proton. The techniques introduced here could be used to obtain heavy-flavour jet results from existing mass less next-to-leading order calculations for a wide range of processes. We also discuss the experimental applicability of our flavoured jet definition.