1210.3074 (Janus Weil et al.)

Investigating in-medium properties of the ω meson via the
ω -> π^0γ decay    [PDF]

Janus Weil, Ulrich Mosel, Volker Metag

We investigate the feasibility of studying in-medium properties of the \omega{} meson in photoproduction experiments via the decay \omega{} -> \pi^0\gamma. We use the GiBUU transport model to compare different methods of obtaining in-medium information, such as the invariant mass spectrum, transparency ratio, excitation function and momentum spectrum. We show that the final-state interaction of the pion poses a major obstacle for the interpretation of the invariant mass spectrum. We also demonstrate that the latter three observables are fairly independent of final-state interactions and thus can give access to the \omega's in-medium properties.

View original: http://arxiv.org/abs/1210.3074