Three- and four-jet final states in photoproduction at HERA

Details Three- and four-jet final states in photoproduction at HERA Three- and four-jet final states in photoproduction at HERA

2007-07-25

arxiv.org/abs/0707.3749v1

Nucl.Phys.B792:1-47,2008

Physics

High Energy Physics

High Energy Physics - Experiment

50 pages, 15 figures, 22 tables, submitted to Nucl. Phys. B

Scientific paper

10.1016/j.nuclphysb.2007.08.021

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 E_T^jet>6 GeV and pseudorapidity |eta^jet|<2.4, in the kinematic region given by the virtuality of the photon Q^2<1 GeV^2 and the inelasticity 0.250 GeV, where M_nj 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 alpha_s^2) perturbative QCD calculation.

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