Photoproduction of the $\omega$ meson on the proton at large momentum transfer

Abstract

The differential cross section, $d\sigma /dt$ for $\omega$ meson exclusive photoproduction on the proton above the resonance region ($2.6<W<2.9$ GeV) was measured up to a momentum transfer $-t=5$ GeV${}^2$ using the CLAS detector at Jefferson Laboratory. The $\omega$ channel was identified by detecting a proton and ${\pi }^{+}$ 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 $-t$ 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.

5 pages, 5 figures