Jet rates in electron-positron annihilation at O(alpha(s)3) in QCD.
We compute production rates for two, three, four, and five jets in electron-positron annihilation at the third order in the QCD coupling constant. At this order, three-jet production is described to next-to-next-to-leading order in perturbation theory while the two-jet rate is obtained at next-to-next-to-next-to-leading order. Our results yield an improved perturbative description of the dependence of jet multiplicity on the jet resolution parameter y{cut}, particularly at small values of y{cut}.
Institute for Theoretical Physics, ETH, CH-8093 Zürich, Switzerland.
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Gehrmann-De Ridder
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Gehrmann
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Glover
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Heinrich