The proton charge radius extracted from the initial-state radiation experiment at MAMI
The European Physical Journal A(2021)
摘要
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 ± 0.011_stat.± 0.031_sys.± 0.002_mod.) fm
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关键词
Initial-state radiation, Proton radius, Radiative corrections
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