A First Study of Multijet Dynamics in Hard Photoproduction at HERA

Strickland, Esther Joanne (1998) A First Study of Multijet Dynamics in Hard Photoproduction at HERA. PhD thesis, University of Glasgow.

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The cross section for the photoproduction of events containing three high transverse energy jets with a three-jet invariant mass of M3J > 50 GeV has been measured with ZEUS at HERA. The data are compared with two different types of QCD prediction; O(alphaalpha2S) pQCD calculations which are leading order for the process under consideration and parton shower models which resum leading logarithms to produce multi-parton final states. The magnitude of the three-jet cross section is in good agreement with the O(alphaalpha2S) pQCD calculations; the parton shower models underestimate the cross section by 20 to 40%. The angular distribution of the three jets is inconsistent with a uniform population of the available phase space. In contrast, parton shower models and O(alphaalpha2S) pQCD calculations are able to describe the three-jet dynamics. Within the parton shower model the relative contribution to three-jet production from initial and final state radiation has been studied and the effect of colour coherence on the angular distribution is demonstrated for the first time.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Additional Information: Adviser: Peter Bussey
Keywords: High energy physics
Date of Award: 1998
Depositing User: Enlighten Team
Unique ID: glathesis:1998-75894
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 19 Nov 2019 17:39
Last Modified: 19 Nov 2019 17:39
URI: https://theses.gla.ac.uk/id/eprint/75894

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