Analysis reveals resonances in nucleon form factors below the NN threshold, indicating new physics implications.
The nucleon magnetic form factors in the unphysical region, i.e. for time-like Q^2 but below the NN ̅ 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 integral equation. Remarkably, resonance structures with peaks for the ρ(770) and ρ'(1600) and a structure near the NN ̅ threshold are automatically generated. The obtained r has a much larger width, whose significance is explored. No evidence is found for a peak at the F mass, in spite of the expectation if there is a sizeable polarized ss ̅ content in the nucleon.
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R. et al. (1998) studied this question.
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