arXiv · 1905.11182
The proton charge radius extracted from the Initial State Radiation experiment at MAMI
Abstract
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 $(0.870 \pm 0.014_\mathrm{stat.}\pm 0.024_\mathrm{sys.} \pm 0.003_\mathrm{mod.})\,\mathrm{fm}$.
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Miha Mihovilovič, Patrick Achenbach, Tobias Beranek, Jure Beričič, Jan C. Bernauer, Ralph Böhm, Damir Bosnar, Matteo Cardinali, Loup Correa, Luka Debenjak, Achim Denig, Michael O. Distler, Anselm Esser, Maria I. Ferretti Bondy, Helene Fonvieille, Jan M. Friedrich, Ivica Friščić, Keith Griffioen, Matthias Hoek, Simon Kegel, Yvonne Kohl, Harald Merkel, Duncan G. Middleton, Ulrich Müller, Josef Pochodzalla, Björn S. Schlimme, Matthias Schoth, Florian Schulz, Concettina Sfienti, Simon Širca, Samo Štajner, Michaela Thiel, Alexey Tyukin, Marc Vanderhaeghen, Adrian B. Weber. 2019-05-27. The proton charge radius extracted from the Initial State Radiation experiment at MAMI. https://arxiv.org/abs/1905.11182
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