Dispersion-theoretical analysis of the nucleon electromagnetic form factors: Inclusion of time-like data

Details Dispersion-theoretical analysis of the nucleon electromagnetic form factors: Inclusion of time-like data Dispersion-theoretical analysis of the nucleon electromagnetic form factors: Inclusion of time-like data

1996-04-11

arxiv.org/abs/hep-ph/9604294v2

Phys.Lett. B385 (1996) 343-347

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pp, LaTeX, uses epsf, 2 figures in separate file, four data points changed, slight changes in the fits, conclusions unchange

Scientific paper

10.1016/0370-2693(96)00865-9

We update a recent dispersion--theoretical fit to the nucleon electromagnetic form factors by including the existing data in the time--like region. We show that while the time--like data for the proton can be described consistently with the existing world space--like data, this is not the case for the neutron. Another measurement of the process $e^+ e^- \to \bar n n$ is called for. We furthermore sharpen the previous estimate of the separation between the perturbative and the non--perturbative regime, which is characterized by a scale parameter $\Lambda^2 \simeq 10\,$GeV$^2$.

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