ω(→ π + π − π 0) meson photoproduction on proton

摘要

The cross-section for the π + π − π 0 invariant mass distribution in the γp reaction in the GeV region is calculated. This reaction is assumed to proceed through the formation of the ω-meson in the intermediate state, because the production cross-section for this meson in the γp reaction in the GeV region is significant and it has a large branching ratio (88.8%) in the π + π − π 0 channel. The cross-sections for this reaction are calculated using the energy-dependent reaction amplitude, f γp→ωp(0), extracted from the latest ω-meson photoproduction data. We use established procedure to calculate other factors, like width and propagator of the ω-meson, so that our calculation can provide reliable cross-section. The calculated results reproduce the measured π + π − π 0 invariant mass distribution spectra in the γp reaction.