Three- and four-jet final states in photoproduction at HERA
Abstract
Three- and four-jet final states have been measured in photoproduction at HERA using the ZEUS detector with an integrated luminosity of 121 pb-1. The results are presented for jets with transverse energy ETjet>6 GeV and pseudorapidity |etajet|<2.4, in the kinematic region given by the virtuality of the photon Q2<1 GeV2 and the inelasticity 0.2<y<0.85 and in two mass regions defined as 25<Mnj<50 GeV and Mnj>50 GeV, where Mnj is the invariant mass of the n-jet system. The four-jet photoproduction cross section has been measured for the first time and represents the highest-order process studied at HERA. Both the three- and four-jet cross sections have been compared with leading-logarithmic parton-shower Monte Carlo models, with and without multi-parton interactions. The three-jet cross sections have been compared to an order(alpha alphas2) perturbative QCD calculation.
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