Abstract
Background: Generalized polarizabilities (GPs) are important observables to describe the nucleon structure, and measurements of these observables are still scarce.
Purpose: This paper presents details of a virtual Compton scattering (VCS) experiment, performed at the A1 setup at the Mainz Microtron by studying the reaction. The article focuses on selected aspects of the analysis.
Method: The experiment extracted the and structure functions, as well as the electric and magnetic GPs of the proton, at three new values of the four-momentum transfer squared : 0.10, 0.20, and .
Results: We emphasize the importance of the calibration of experimental parameters. The behavior of the measured cross section is presented and compared to the theory. A detailed investigation of the polarizability fits reveals part of their complexity, in connection with the higher-order terms of the low-energy expansion.
Conclusions: The presented aspects are elements which contribute to minimize the systematic uncertainties and improve the precision of the physics results.
8 More- Received 26 August 2020
- Accepted 26 January 2021
DOI:https://doi.org/10.1103/PhysRevC.103.025205
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