Study of the ϕπ0 transition form factor

In 2008 the BaBar Collaboration published new data on the cross section for the annihilation e+e−→ϕπ0, 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 ϕπ0 production via e+e− annihilation proceeds through a mechanism which violates the Okubo–Zweig–Iizuka rule, the corresponding cross section could be characterized by contributions from non-qq¯ bound states, like hybrids or tetraquarks. However the nature of such possible non-standard contributions will be not investigated in the following. The ϕπ0 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 ϕπ0 transition form factor by means of a dispersion relation procedure