Photoproduction of the ω Meson on the Proton at Large Momentum Transfer

Le résumé fourni par la source

The differential cross section, $d\ensuremath{\sigma}/dt$, for $\ensuremath{\omega}$ meson exclusive photoproduction on the proton above the resonance region ($2.6<W<2.9\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$) was measured up to a momentum transfer $\ensuremath{-}t=5\text{ }\text{ }{\mathrm{G}\mathrm{e}\mathrm{V}}^{2}$ using the CLAS detector at Jefferson Laboratory. The $\ensuremath{\omega}$ channel was identified by detecting a proton and ${\ensuremath{\pi}}^{+}$ in the final state and using the missing mass technique. While the low momentum transfer region shows the typical diffractive pattern expected from Pomeron and Reggeon exchange, at large $\ensuremath{-}t$ the differential cross section has a flat behavior. This feature can be explained by introducing quark interchange processes in addition to the QCD-inspired two-gluon exchange.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.