Exclusive Photoproduction of Omega Mesons at Fermilab Energies.

Data are analyzed from a photoproduction experiment (E152) at Fermilab with a tagged photon beam of energy ranging from 52 to 127 Gev. A procedure for the isolation of exclusive (elastic and quasi-elastic) final states containing (multi) showering particles is worked out. The channel. (gamma)p (--->) (omega)p (omega) (--->) (pi)('0)(gamma) (pi)('0) (--->) (gamma)(gamma). is analyzed. A preliminary measurement of the cross section, its dependence on beam energy and on 4-momentum transfer is performed. The differential cross section exhibits a forward exponential peak with a slope b = 8.0 (+OR-) 2.1 in good agreement with previous experiments.