Dissertation/Thesis Abstract

Effects beyond the Born Approximation for the Elastic Scattering of Leptons by a Nucleon
by Koshchii, Oleksandr, Ph.D., The George Washington University, 2019, 204; 10846809
Abstract (Summary)

Elastic lepton scattering off of a nucleon has proven to be an efficient tool to study the structure of the hadron. In particular, the spatial distributions of the nucleon's charge and magnetization can be accessed through measurements of its electric (GE) and magnetic (G M) form factors. These form factors can be extracted from unpolarized cross sections measurements by using the Rosenbluth separation technique. At the current level of accuracy, a determination of GE and GM from an analysis of elastic lepton-nucleon scattering data requires effects beyond the leading-order (Born) approximation to be taken into account.

In this work, I study higher-order QED corrections to elastic lepton-nucleon scattering. First of all, I perform a model-independent calculation of conventional charge-dependent contributions in unpolarized lepton-proton scattering without making use of ultra-relativistic approximations. Second, in a connection to the future MUSE experiment in Switzerland, I estimate helicity-flip meson exchanges that make a difference in a comparison of ultra-relativistic vs non-ultra-relativistic lepton-proton scattering. Finally, I present a model calculation of the target-normal single-spin asymmetry in elastic electron-nucleon scattering. Such an asymmetry gives us a direct tool to studies of the imaginary part of the two-photon exchange amplitude.

Indexing (document details)
Advisor: Afanasev, Andrei V.
Commitee: Briscoe, William J., Carlson, Carl E., Griesshammer, Harald W., van der Horst, Alexander J.
School: The George Washington University
Department: Physics
School Location: United States -- District of Columbia
Source: DAI-B 80/05(E), Dissertation Abstracts International
Subjects: Physics, Theoretical physics, Particle physics
Keywords: Charge asymmetry, Elastic lepton scattering, Helicity-flip exchange, Single-spin asymmetry, Target-normal asymmetry, Two-photon exchange
Publication Number: 10846809
ISBN: 978-0-438-76958-8
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