The proton charge radius extracted from the initial-state radiation experiment at MAMI
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We report on a comprehensive reinterpretation of the existing cross-section data for elastic electron-proton scattering obtained by the initial-state radiation technique, resulting in a significantly improved accuracy of the extracted proton charge radius. By refining the external energy corrections we have achieved an outstanding description of the radiative tail, essential for a detailed investigation of the proton finite-size effects on the measured cross sections. This development, together with a novel framework for determining the radius, based on a regression analysis of the cross sections employing a polynomial model for the form factor, led us to a new value for the charge radius, which is (0.878±0.011stat.±0.031sys.±0.002mod.)fm
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The European physical journal : A, Hadrons and nuclei, 57, Springer, Berlin u.a., 2021, https://doi.org/10.1140/epja/s10050-021-00414-x