Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-08-31
Phys.Rev.C75:035202,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 9 figures
Scientific paper
10.1103/PhysRevC.75.035202
Dispersion relations provide a powerful tool to analyse the electromagnetic form factors of the nucleon for all momentum transfers. Constraints from meson-nucleon scattering data, unitarity, and perturbative QCD can be included in a straightforward way. In particular, we include the 2pi, rho-pi, and KKbar continua as independent input in our analysis and provide an error band for our results. Moreover, we discuss two different methods to include the asymptotic constraints from perturbative QCD. We simultaneously analyze the world data for all four form factors in both the space-like and time-like regions and generally find good agreement with the data. We also extract the nucleon radii and the omega-NN coupling constants. For the radii, we generally find good agreement with other determinations with the exception of the electric charge radius of the proton which comes out smaller. The omega-NN vector coupling constant is determined relatively well by the fits, but for the tensor coupling constant even the sign can not be determined.
Belushkin M. A.
Hammer Hans-Werner
Meißner Ulf-G.
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