Study of the image transition form factor

In 2008 the BaBar Collaboration published new data on the cross section for the annihilation image, obtained using the initial state radiation technique at a center of mass energy of 10.6 GeV. Such a process represents an interesting test bed for the quark model. Indeed, since the image production via image annihilation proceeds through a mechanism which violates the Okubo–Zweig–Iizuka rule, the corresponding cross section could be characterized by contributions from non-image bound states, like hybrids or tetraquarks. However the nature of such possible non-standard contributions will be not investigated in the following. The image cross section is analyzed in connection with other data coming from different processes, that involve the same mesons, using a method which implements the analyticity in the image transition form factor by means of a dispersion relation procedure.