Measurement of Three-jet Distributions in Photoproduction at HERA
ZEUS Collaboration
Abstract
The cross section for the photoproduction of events containing three jets with a three-jet invariant mass of M3J > 50 GeV has been measured with the ZEUS detector at HERA. The three-jet angular distributions are inconsistent with a uniform population of the available phase space but are well described by parton shower models and O(alpha alphas2) pQCD calculations. Comparisons with the parton shower model indicate a strong contribution from initial state radiation as well as a sensitivity to the effects of colour coherence.
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