The nucleon magnetic form factors in the unphysical region, i.e., for time-like Q2 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 the integral equation. Remarkably, resonance structures with peaks for the (770) and 0(1600) and a structure near the NN threshold are automatically generated. The obtained has a much larger width, whose signicance is explored. No evidence is found for a peak at the mass, in spite of the expectation that such a peak exists when there is a sizeable polarized ss content in the vector current of the nucleon.
Scheda prodotto non validato
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo
|Titolo:||Nucleon time-like form factors below the NN threshold|
|Data di pubblicazione:||1999|
|Appartiene alla tipologia:||01a Articolo in rivista|