Nucleon form factors: the space-time connection

Abstract

Analyticity of nucleon form factors allows to derive sum rules which, using space-like and time-like data as input, can give unique information about behaviors in energy regions not experimentally accessible. Taking advantage from new time-like data on proton-antiproton differential cross section and hence the possibility to separate electric and magnetic form factors also in the time-like region, we verify the consistency of the asymptotic behavior predicted by the perturbative QCD for the proton magnetic form factor.

Comments: 3 pages, 1 figure. Prepared for "PHIPSI09" Conference, October 13-16, 2009 - IHEP, Beijing, China