Measurements of Event Shapes in Deep Inelastic Scattering at HERA with ZEUS

Measurements of Event Shapes in Deep Inelastic Scattering at HERA with ZEUS by Adam A. Everett A dissertation submitted in partial fulllment of the requirements for the degree of Doctor of Philosophy (Physics) at the University of Wisconsin { Madison 2006 Copyright by Adam A. Everett 2006 All Rights Reserved Measurements of Event Shapes in Deep Inelastic Scattering at HERA with ZEUS Adam A. Everett Under the supervision of Professor Wesley H. Smith At the University of Wisconsin | Madison Mean values and dierential distributions of event-shape variables have been studied in neutral current deep inelastic scattering using an integrated luminosity of 82.2 inverse pico-barns collected with the ZEUS detector at HERA. The kinematic range was Q-squared from 80 to 20480 GeV-squared and Bjorken-x from 0.0024 to 0.6, where Q-squared is the virtuality of the exchanged boson. The Q-dependence is com- pared with a model based a combination of next-to-leading-order QCD calculations with next-to-lead-logarithm corrections and the Dokshitzer-Webber non-perturbative power corrections. 4 i Abstract Mean values and dierential distributions of event-shape variables have been studied in neutral current deep inelastic scattering using an integrated luminosity of 82.2 pb 1 collected with the ZEUS detector at HERA. The kinematic range was 80 < Q2 < 20480GeV2 and 0:0024 < x < 0:6, where Q2 is the virtuality of the exchanged boson and x is the Bjrken variable. The Q-dependence is compared with a model based a combination of next-to-leading-order QCD calculations with next-to-lead- logarithm corrections and the Dokshitzer-Webber non-perturbative power corrections. ... - tailieumienphi.vn