Investigating in-medium properties of the $ω$ meson via the $ω\rightarrowπ^0γ$ decay

Abstract

We investigate the feasibility of studying in-medium properties of the $ω$ meson in photoproduction experiments via the decay $ω\rightarrowπ^0γ$. 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. The other three observables turn out to be fairly independent of final-state interactions and thus can give access to the $ω$'s in-medium properties.

8 pages, 6 figures