ISSN:
1434-6052
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract. The nucleon magnetic form factors in the unphysical region, i.e., for time-like $Q^2$ but below the N $\overline{\mathrm{N}}$ threshold, have been obtained by means of dispersion relations in a model-independent way, without any bias towards expected resonances. Space-like and time-like data have been employed, along with a regularization unfolding method to solve the integral equation. Remarkably, resonance structures with peaks for the $\rho (770)$ and $\rho^{\prime} (1600)$ and a structure near the $\mathrm{N} \overline{\!\mathrm{N}}$ threshold are automatically generated. The obtained $\rho$ has a much larger width, whose significance is explored. No evidence is found for a peak at the $\Phi$ mass, in spite of the expectation that such a peak exists when there is a sizeable polarized s $\overline{\mathrm{s}}$ content in the vector current of the nucleon.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100529900077
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