Three-Jet Production in Deep-Inelastic Scattering at HERA
Abstract
Three-jet production is studied for the first time in deep-inelastic positron-proton scattering. The measurement carried out with the H1 detector at HERA covers a large range of four-momentum transfer squared 5 < Q2 < 5000 GeV2 and invariant three-jet masses 25 < M(3jet) < 140 GeV. Jets are defined by the inclusive kT algorithm in the Breit frame. The size of the three-jet cross section and the ratio of the three-jet to the dijet cross section R(3/2) are described over the whole phase space by the predictions of perturbative QCD in next-to-leading order. The shapes of angular jet distributions deviate significantly from a uniform population of the available phase space but are well described by the QCD calculation.
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