Abstract
A new way to define a Sterman-Weinberg jet is described. The fraction of hadronic final states frome + e − annihilation consisting of 2 jets is obtained exactly to order α s Q 2 in QCD perturbation theory using two opposed cones along the thrust axis. Conditions on the parton phase space are discussed in detail. The deviation of the jet angular distribution from 1+cos2 θ is also obtained. In contrast to some previously proposed 2 jet definitions we find no restriction of the range of applicability by a relation between the Sterman-Weinberg parameters ɛ and δ. This definition allows a very easy comparison with experimental data. A rough estimate of the fragmentation effects on the fraction of 2 jet events is also presented.
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