Date of Award

Summer 2012

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Computational Analysis and Modeling

First Advisor

Lee Sawyer

Abstract

This dissertation presents the analysis of nine different event shapes measured in high energy pp¯ collisions. An event shape can be defined as an event-based quantity that measures how the final energies are distributed in the final event. This analysis will test strong interactions as described by Quantum Chromodynamics (QCD), through their implementation in different Monte Carlo-based models. Each of the event shapes provides information about the flow of energy in QCD events and about the hadronic final states that occur in pp¯ particle collisions, thus allowing the study of the dynamics of QCD multijet events. Any deviation of an event shape from zero will be indicative of higher-order effects, meaning that more than the two jets were produced in the event. For each of the event shapes, both normalized differential distributions [special characters omitted] and average event shapes (X¯) were measured, where X is the event shape and σ is the cross section. This analysis uses 0.7 fb−1 of data taken between 2004 and 2006 by the DØ detector located at the Fermi National Accelerator Lab (Fermilab) in Batavia, IL, using pp¯ collisions at a center-of-mass energy of [special characters omitted] = 1.96 TeV.

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