Measurements of exclusive photoproduction processes at large values of t and u from 4 to 7.5 GeV

Exclusive photoproduction cross sections have been measured for the processes γp→π⁺n, γp→π⁰p, γp→π^-Δ⁺⁺, γp→ρ⁰p, γp→K⁺Λ, and γp→K⁺Σ⁰ at large t and u values at several energies for each process between 4 and 7.5 GeV. These measurements taken together with past data taken at small values of t and u provide complete angular distributions. The data show the usual small t and u peaks and a central region in which the cross section decreases approximately as s^-7. The results are discussed within the context of parton or constituent models.