Theses and Dissertations from UMD

Permanent URI for this communityhttp://hdl.handle.net/1903/2

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

Browse

Filters

20171

Settings

Author: search.filters.author.Wimberley, Jack

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    SEMITAUONIC B_c^+ DECAYS AND QUARK FLAVOR IDENTIFICATION METHODS
    (2017) Wimberley, Jack; Jawahery, Abolhassan; Physics; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    The LHCb experiment at the Large Hadron collider is a unique laboratory for studying the properties of heavy quarks. The physics program of the experiment includes studies of CP violation, measurements of CKM matrix parameters, searches for rare decays, quarkonia studies, and other flavor physics, forward physics, and new physics topics. This thesis presents an analysis of the semitauonic branching fraction $\mathcal{B}(B_c^+ \to J/\psi \tau^+ \nu_\tau)$ of the doubly-heavy $B_c^+$ meson, which serves as a powerful probe of the universality of the couplings of leptons ($e$, $\mu$ and $\tau$) in electroweak interactions. The ratio of this branching fraction to the semimuonic branching fraction $\mathcal{B}(B_c^+ \to J/\psi \mu^+ \nu_\mu)$ is measured to be $\mathcal{R}(J/\psi) = 0.71 \pm 0.17 \mathrm{\,(stat)} \pm 0.18\mathrm{\,(syst)}$. A second topic of the thesis is the creation of a new algorithm for tagging the flavor of neutral mesons in CP violation studies, and a powerful method for calibrating these flavor tagging algorithms via binomial regression.