Strickland, Esther Joanne
(1998)
A First Study of Multijet Dynamics in Hard Photoproduction at HERA.
PhD thesis, University of Glasgow.
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Abstract
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: |
http://theses.gla.ac.uk/id/eprint/75894 |
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