The proton charge radius extracted from the initial-state radiation experiment at MAMI

Mihovilovič, M.; Achenbach, P.; Beranek, T.; Beričič, J.; Bernauer, J. C.; Böhm, R.; Bosnar, D.; Cardinali, M.; Correa, L.; Debenjak, L.; Denig, A.; Distler, M. O.; Esser, A.; Ferretti Bondy, M. I.; Fonvieille, H.; Friedrich, J. M.; Friščić, I.; Hoek, M.; Kegel, S.; Merkel, H.; Middleton, D. G.; Müller, U.; Pochodzalla, J.; Schlimme, B. S.; Schoth, M.; Schulz, F.; Sfienti, C.; Širca, S.; Štajner, S.; Stöttinger, Y.; Thiel, M.; Tyukin, A.; Vanderhaeghen, M.; Weber, A. B.

doi:10.1140/epja/s10050-021-00414-x

The proton charge radius extracted from the initial-state radiation experiment at MAMI

Journal Article · 01 March 2021 · European Physical Journal. A

DOI:https://doi.org/10.1140/epja/s10050-021-00414-x· OSTI ID:1850069

Mihovilovič, M. ^[1]; Achenbach, P.; Beranek, T.; Beričič, J.; Bernauer, J. C.; Böhm, R.; Bosnar, D.; Cardinali, M.; Correa, L.; Debenjak, L.; Denig, A.; Distler, M. O.; Esser, A.; Ferretti Bondy, M. I.; Fonvieille, H.; Friedrich, J. M.; Friščić, I.; Hoek, M.; Kegel, S.; Merkel, H. more »

OSTI

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$$$$(0.878 \pm 0.011_\mathrm {stat.}\pm 0.031_\mathrm {sys.}\pm 0.002_\mathrm {mod.})\,\mathrm {fm}$$$$ $(0.878 \pm 0 . 011_{stat .} \pm 0 . 031_{sys .} \pm 0 . 002_{\mod .}) fm$

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); College of William and Mary, Williamsburg, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-94ER40818; FG02-96ER41003;

OSTI ID:: 1850069

Journal Information:: European Physical Journal. A, Journal Name: European Physical Journal. A Journal Issue: 3 Vol. 57; ISSN 1434-6001

Publisher:: Springer

Country of Publication:: United States

Language:: English

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