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Full-Text Articles in Physical Sciences and Mathematics
Large-NC Constraints For One- And Two-Nucleon Currents In Effective Field Theory, Thomas Richardson
Large-NC Constraints For One- And Two-Nucleon Currents In Effective Field Theory, Thomas Richardson
Theses and Dissertations
There is a long-standing goal of understanding nuclear physics in terms of quarks and gluons, the constituent particles of nucleons. However, the underlying theory is strongly coupled at the scales relevant for nuclear physics; therefore, this goal can only be achieved through nonperturbative calculations. Additionally, nuclear targets are employed in a variety of experiments ranging from electroweak processes to Beyond the Standard Model physics. Thus, it is important to have a strong theoretical foundation for nuclear physics in the presence of external fields in order to interpret experimental results. Effective field theory (EFT) for nuclear physics constitutes a systematic and …
Measurement Of N* Cross-Sections From Single-Pion Electroproduction At Low Q^2, Nicholas Scoville Tyler
Measurement Of N* Cross-Sections From Single-Pion Electroproduction At Low Q^2, Nicholas Scoville Tyler
Theses and Dissertations
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 …