Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-08-26
Phys.Rev.D82:113005,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 4 figures. v2: references added, minor typos corrected, version to appear in PRD
Scientific paper
10.1103/PhysRevD.82.113005
Constraints from analyticity are combined with experimental electron-proton scattering data to determine the proton charge radius. In contrast to previous determinations, we provide a systematic procedure for analyzing arbitrary data without model-dependent assumptions on the form factor shape. We also investigate the impact of including electron-neutron scattering data, and $\pi\pi\to N\bar{N}$ data. Using representative datasets we find r_E^p=0.870 +/- 0.023 +/- 0.012 fm using just proton scattering data; r_E^p=0.880^{+0.017}_{-0.020} +/- 0.007 fm adding neutron data; and r_E^p=0.871 +/- 0.009 +/- 0.002 +/- 0.002 fm adding $\pi\pi$ data. The analysis can be readily extended to other nucleon form factors and derived observables.
Hill Richard J.
Paz Gil
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