Measurement of Three-jet Distributions in Photoproduction at HERA

Details Measurement of Three-jet Distributions in Photoproduction at HERA Measurement of Three-jet Distributions in Photoproduction at HERA

1998-10-28

arxiv.org/abs/hep-ex/9810046v1

Phys.Lett.B443:394-408,1998

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages including 5 figures

Scientific paper

10.1016/S0370-2693(98)01360-4

The cross section for the photoproduction of events containing three jets with a three-jet invariant mass of M_3J > 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 alpha_s^2) 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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