Dijet angular distributions provide a excellent look at the interactions between partons. The measurements performed by the DO detector are the most precise accomplished to date at pp colliders and cover a larger angular range than previously possible. Both leading order and next-to-leading order QCD calculations show agreement with the data over a large range in dijet invariant mass. This comparison is limited mainly by the large size of the theoretical uncertainties which are larger than the experimental uncertainties for some mass ranges. Additionally, a limit on quark compositeness of Λ(C) > 1.1 TeV has been obtained.

This thesis describes work towards the search for a low energy excess of electromagnetic events in the MicroBooNE detector. A background primer on the current state of neutrino physics is provided, including a description of the MiniBooNE detector and its published observation of an excess of electromagnetic events at low energies. A description of the MicroBooNE Liquid Argon Time Projection Chamber (LArTPC) detector is given, along with a description of the event selection and reconstruction algorithms developed to select electron neutrino charge-current interactions. A MiniBooNE-like signal is simulated in MicroBooNE with assumptions about the origin of the excess, and the sensitivity to observe such a signal above backgrounds in MicroBooNE is computed. An additional analysis is presented which constrains a dominant background in the MicroBooNE low energy excess search: the beam-intrinsic electron neutrino interactions which come from kaon decay in the beam-line. An essential step in this analysis is to reconstruct the energy of muon neutrino charge-current interactions in which the muon produced in the interaction escapes the detector. A publication detailing the algorithm which leverages the phenomenon of multiple Coulomb scattering to reconstruct the energy of escaping muons is provided as an appendix.

Graduation date: 2001

Thesis (Ph. D.)--University of Chicago, Dept. of Physics, August 1997. / Includes bibliographical references. Also available on the Internet.

Thesis (Ph. D.)--Middle East Technical University, 2004. / Keywords: B-meson decays, Branching Ratio, Lepton Polarization Asymmetry.

Thesis--Johns Hopkins University. / Vita. Includes bibliographical references.

Thesis (Ph. D.)--University of Oregon, 2000. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 144-147). Also available for download via the World Wide Web; free to University of Oregon users.

Thesis (Ph. D.)--University of Hong Kong, 1980. / Typescript.

Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (p. 125-130).

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