In the present analysis, the constant alphas of Quantum Chromodynamics (QCD) is determined from dijets production in the regime of neutral current deep inelastic scattering (NC DIS) with high momentum transfer Q2. This measurement uses the data collected between the years 1998 to 2000 by the ZEUS detector located on the HERA ring collider in Hamburg, Germany. Corresponding to an integrated luminosity of 82.7 pb-1, the data were produced by the interactions between 27.5 GeV electrons (or positrons) and 920 GeV protons. Defined in a phase space reducing the theoretical and systematic uncertainties, the dijet production is observed as well as the total inclusive DIS cross-section. The resulting observable, the ratio of dijets over the number of DIS events, is then compared to the NLO predictions provided by the program DISENT. From a QCD fit performed on four bins in Q2, we obtain a value consistent with the world average: alpha s(MZ) = 0.1157 +/- 0.0017( stat.) +0.0054-0.00 59 (syst.) +0.0075-0.00 65 (th.).
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.82407 |
| Date | January 2005 |
| Creators | Plamondon, Mathieu |
| 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: 002227384, proquestno: AAIMR12522, Theses scanned by UMI/ProQuest. |
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