1206.3098 (Sebastian P. Schneider et al.)

The omega --> pi0 gamma* and phi --> pi0 gamma* transition form factors
in dispersion theory    [PDF]

Sebastian P. Schneider, Bastian Kubis, Franz Niecknig

We calculate the omega --> pi0 gamma* and phi --> pi0 gamma* electromagnetic transition form factors based on dispersion theory, relying solely on a previous dispersive analysis of the corresponding three-pion decays and the pion vector form factor. We compare our findings to recent measurements of the omega --> pi0 mu+ mu- decay spectrum by the NA60 collaboration, and strongly encourage experimental investigation of the Okubo-Zweig-Iizuka-forbidden phi --> pi0 l+ l- decays in order to understand the strong deviations from vector-meson dominance found in these transition form factors.

View original: http://arxiv.org/abs/1206.3098