#### ${{\mathit p}}$ MAGNETIC RADIUS

This is the rms magnetic radius, $\sqrt {\langle r{}^{2}_{M}\rangle }$.

VALUE (fm) DOCUMENT ID TECN  COMMENT
$0.851$ $\pm0.026$ 1
 2015
Combination of world and Mainz data
• • We do not use the following data for averages, fits, limits, etc. • •
$0.817$ $\pm0.027$ 2
 2021 B
FIT use existing ${{\mathit e}}{{\mathit p}}$ data
$0.87$ $\pm0.02$
 2014
Using ${{\mathit e}}{{\mathit p}}$ , ${{\mathit e}}{{\mathit n}}$ , ${{\mathit \pi}}{{\mathit \pi}}$ data
$0.867$ $\pm0.009$ $\pm0.018$
 2011
SPEC Recoil polarimetry
$0.777$ $\pm0.013$ $\pm0.010$
 2010
SPEC ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit p}}$ form factor
$0.876$ $\pm0.010$ $\pm0.016$
 2010
Reanalyzes old ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit p}}$ data
$0.854$ $\pm0.005$
 2007
Dispersion analysis
 1 In a consistent reanalysis LEE 2015 extract values separately for the Mainz 2010 data only (0.776+-0.034+-0.017) fm and for the world data without Mainz data (0.914+-0.035) fm. The quoted value is a simple combination of the two, which ignores possible discrepancies and unknown correlations and should be considered with caution.
 2 CUI 2021B employ a new mathematical procedure (statistical SPM, Schlessinger point method) based on form-unbiased interpolations of existing ${{\mathit e}}{{\mathit p}}$ scattering data.
References:
 CUI 2021B
CPL 38 121401
 LEE 2015
PR D92 013013 Extraction of the Proton Radius from Electron-Proton Scattering Data
 EPSTEIN 2014
PR D90 074027 Model Independent Extraction of the Proton Magnetic Radius from Electron Scattering
 ZHAN 2011
PL B705 59 High-Precision Measurement of the Proton Elastic Form Factor Ratio $\mathit \mu _{p}G_{E}/G_{M}$ at low $\mathit Q{}^{2}$
 BERNAUER 2010
PRL 105 242001 High-Precision Determination of the Electric and Magnetic Form Factors of the Proton
 Also
PR C90 015206 Electric and Magnetic Form Factors of the Proton
 BORISYUK 2010
NP A843 59 Proton Charge and Magnetic rms Radii from the Elastic ${{\mathit e}}{{\mathit p}}$ Scattering data
 BELUSHKIN 2007
PR C75 035202 Dispersion Analysis of the Nucleon Form Factors Including Meson Continua