Non-forward radiative corrections to electron-carbon scattering
Authors:
M. Mihovilovič,
A. B. Weber,
P. Achenbach,
M. Bajec,
T. Beranek,
J. Beričič,
J. C. Bernauer,
D. Bosnar,
R. Böhm,
M. Cardinali,
L. Correa,
L. Debenjak,
A. Denig,
M. O. Distler,
A. Esser,
M. I. Feretti Bondy,
H. Fonvieille,
J. M. Friedrich,
I. Friščić,
K. Griffioen,
M. Hoek,
S. Kegel,
D. G. Middleton,
H. Merkel,
U. Müller
, et al. (15 additional authors not shown)
Abstract:
Radiative corrections to elastic scattering represent an important part of the interpretation of electron-induced nuclear reactions at small energy transfers, where they make for a dominant part of background. Here we present and validate a new event generator for mimicking QED radiative processes in electron-carbon scattering that exactly calculates the coherent sum of the Bethe-Heitler amplitude…
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Radiative corrections to elastic scattering represent an important part of the interpretation of electron-induced nuclear reactions at small energy transfers, where they make for a dominant part of background. Here we present and validate a new event generator for mimicking QED radiative processes in electron-carbon scattering that exactly calculates the coherent sum of the Bethe-Heitler amplitudes for the leading diagrams and can be reliably employed for a more robust determination of inelastic cross-sections.
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Submitted 21 March, 2023;
originally announced March 2023.
Measurement of the Generalized Polarizabilities of the Proton at Intermediate $Q^2$
Authors:
H. Fonvieille,
J. Beričič,
L. Correa,
M. Benali,
P. Achenbach,
C. Ayerbe Gayoso,
J. C. Bernauer,
A. Blomberg,
R. Böhm,
D. Bosnar,
L. Debenjak,
A. Denig,
M. O. Distler,
E. J. Downie,
A. Esser,
I. Friščić,
S. Kegel,
Y. Kohl,
M. Makek,
H. Merkel,
D. G. Middleton,
M. Mihovilovič,
U. Müller,
L. Nungesser,
M. Paolone
, et al. (13 additional authors not shown)
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 $e p \to e p γ$ reaction. The article focuses on selected aspects of the analysis. M…
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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 $e p \to e p γ$ reaction. The article focuses on selected aspects of the analysis. Method: The experiment extracted the $P_{LL} -P_{TT} / ε$ 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 $e p \to e p γ$ 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.
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Submitted 11 February, 2021; v1 submitted 20 August, 2020;
originally announced August 2020.