Photoproduction events which have two or more jets have been studied in the $W sb{ gamma p}$ range 135 GeV $< W sb{ gamma p} <$280 GeV with the ZEUS detector at HERA. A class of events is observed with little hadronic activity between the jets. The jets are separated by pseudorapidity intervals (${ Delta eta}$) of up to four units and have transverse energies greater than 6 GeV. A gap is define as the absence between the jets of particles with transverse energy greater than 300 MeV. The fraction of events containing a gap is measured as a function of ${ Delta eta}$. It decreases exponentially as expected for processes in which colour is exchanged between the jets, up to a value of ${ Delta eta} sim3$, then reaches a constant value of about 0.1. The excess above the exponential fall-off can be interpreted as evidence for hard scattering via a strongly interacting colour singlet object.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.40255 |
| Date | January 1995 |
| Creators | Sinclair, Laurel E. (Laurel Elizabeth) |
| Contributors | Patel, P. M. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Physics.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001485951, proquestno: NN12486, Theses scanned by UMI/ProQuest. |
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