Comparison of results for the electromagnetic form factors of the proton at low Q2
Evangelos Matsinos
Hide abstract | Show figures | Show BibTeX | Show discussion | View PDF | 2009.04156v1
The goal in this work is the comparison of five parameterisations of the Sachs form factors of the proton GpE (electric) and GpM (magnetic) at low 4-momentum transfer Q2. It will be shown that a simple model, based on two dipoles which admit as parameters the rms electric charge radius rE;p and the rms magnetic radius rM;p of the proton, suffices for the purposes of the phase-shift analyses (PSAs) of the low-energy pion-nucleon (πN) data. The replacement of the electromagnetic form factors, currently used in the ETH model of the πN interaction, by the parameterisation of this work will enable the removal from the PSAs of this research programme of the largest part of the dependence on extraneous sources.
Authors' comments: 20 pages, 4 figures, 1 table
