Report
Measurement of the Generalized Polarizabilities of the Proton at Intermediate $Q^2$
| العنوان: | Measurement of the Generalized Polarizabilities of the Proton at Intermediate $Q^2$ |
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| المؤلفون: | Fonvieille, H., Beričič, J., Correa, L., Benali, M., Achenbach, P., Gayoso, C. Ayerbe, Bernauer, J. C., Blomberg, A., Böhm, R., Bosnar, D., Debenjak, L., Denig, A., Distler, M. O., Downie, E. J., Esser, A., Friščić, I., Kegel, S., Kohl, Y., Makek, M., Merkel, H., Middleton, D. G., Mihovilovič, M., Müller, U., Nungesser, L., Paolone, M., Pochodzalla, J., Majos, S. Sánchez, Schlimme, B. S., Schoth, M., Schulz, F., Sfienti, C., Širca, S., Sparveris, N., Štajner, S., Thiel, M., Tyukin, A., Weber, A., Weinriefer, M. |
| المصدر: | Phys. Rev. C 103, 025205 (2021) |
| سنة النشر: | 2020 |
| المجموعة: | High Energy Physics - Phenomenology Nuclear Experiment Nuclear Theory |
| مصطلحات موضوعية: | Nuclear Experiment, High Energy Physics - Phenomenology, Nuclear Theory |
| الوصف: | 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 $e p \to e p \gamma$ reaction. The article focuses on selected aspects of the analysis. Method: The experiment extracted the $P_{LL} -P_{TT} / \epsilon$ and $P_{LT}$ structure functions, as well as the electric and magnetic GPs of the proton, at three new values of the four-momentum transfer squared $Q^2$: 0.10, 0.20 and 0.45 GeV$^2$. Results: We emphasize the importance of the calibration of experimental parameters. The behavior of the measured $e p \to e p \gamma$ 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. Comment: 16 pages, 15 figures, Version 4, regular article to appear in Phys.Rev.C, more final version of some figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevC.103.025205 |
| URL الوصول: | http://arxiv.org/abs/2008.08958 |
| رقم الانضمام: | edsarx.2008.08958 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevC.103.025205 |
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