Date of Award

Spring 2021

Document Type

Open Access Dissertation

Department

Physics and Astronomy

First Advisor

Ralf Gothe

Abstract

Measurements of nucleon electroexcitation resonance cross-sections give unique insight into the dynamics of the strong interaction and our knowledge of Quantum Chromodynamics (QCD). The analysis of exclusive electroproduction data is an important tool in understanding the structure of the nucleon and its excited states. Exclusive channels give a clear way to extract the desired resonant contributions from non-resonant contributions. A gap in the helicity amplitudes extracted from single-pion cross-section data exists for virtual photon momentum transfers ($Q^2$) in the range of $1-2~\mathrm{GeV}^{2}$. Using data collected by the CEBAF Large Acceptance Spectrometer (CLAS) detector with a beam energy of $4.8~\mathrm{GeV}$, the reaction channel $\gamma^{*}p \rightarrow n\pi^{+}$ is used in this study to investigate the kinematic region covering $W=[1.1,1.82)~\mathrm{GeV}~\mathrm{and}~Q^2=[1.1,3.5)~\mathrm{GeV}^2$. This work expands on the previous kinematic coverage for charged single-pion electroproduction and increases the angular coverage of previously extracted kinematic bins.

Included in

Physics Commons

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