Eur. Phys. J. C (2006) 46: 421-428
https://doi.org/10.1140/epjc/s2006-02499-4

Theoretical Physics

A description of the ratio between electric and magnetic proton form factors by using space-like, time-like data and dispersion relations

¹ Centro Studi e Ricerche Enrico Fermi, Roma, Italy
² Laboratori Nazionali di Frascati dell’INFN, Frascati, Italy
³ Università “La Sapienza” e Sezione INFN, Roma, Italy
⁴ Università di Ferrara e Sezione INFN, Ferrara, Italy

^* e-mail: simone.pacetti@lnf.infn.it

Received: 8 July 2005
Published online: 31 March 2006

Abstract

We use the available information on the ratio between the electric and magnetic proton form factors coming from recently published space-like data and from the few available time-like data. We apply a dispersive procedure on these data to evaluate the behavior of this ratio, as a complex function, for all values of q².