The s and? dependence of incoherent #(3100) photoproduction from deuterium has been measured at the Stanford Linear Accelerator Center. #(3700) photoproduction and #(3100) photoproduction from hydrogen have also been measured.
Exclusive photoproduction cross sections have been measured for the processes y p + r + n , y p -r a p , y p i r r -~+ + , y p i p o P , y p -' K + A , and y p i K + z O 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 -'. The results are discussed within the context of parton or constituent models.
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