The photoproduction of D+/-s mesons has been measured with the ZEUS detector at HERA. The data sample corresponds to an integrated luminosity of 121.6 pb-1 . The total and differential cross-sections as functions of the Ds transverse momentum, pseudorapidity and photon-proton center-of-mass energy are measured for 3 < pt( Ds) < 12 GeV, |eta(Ds)| < 1.5 and 130 < W < 280 GeV. The total measured cross-section is sep→DsX = 3.869+/-0.286+0.134-0.150 nb. The measurements are compared with leading-order Monte Carlo simulations as well as next-to-leading order perturbative QCD calculations. / The ratio of D+/-s to D*+/- mesons cross-sections was used to measure the strangeness suppression factor gamma s within the Lund string fragmentation model. Using PYTHIA and CASCADE Monte Carlo simulations, the obtained values are gamma s = 0.281+/-0.205+0.0096-0.0116 and gammas = 0.263+/-0.0189+0.0081-0.0133 , respectively, which are in good agreement with previous measurements and with e+e- annihilations.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.80278 |
| Date | January 2003 |
| Creators | Gliga, Sebastian |
| Contributors | Corriveau, Francois (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 | Master of Science (Department of Physics.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 002151959, proquestno: AAIMQ98647, Theses scanned by UMI/ProQuest. |
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