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We report on an experiment to obtain differential cross sections for K + p elastic scattering in the vicinity of the possible exotic baryon, the Z:(1900).The d~fferential cross sections are based on typically 70 000 selected events in the angular region-0.9 5 cosOi, 0.9 at each of 22 momenta from 0.865 to 2.125 GeV/c. The data are intended for use in partial-wave analysis to search for the z:.

We measured the differential production cross section for producing pions in 12.2-GeV/c p-p collisions on lines of fixed P j and P ± in the cm. system. We found that d 2 cr/ dQdp is maximum at Pj =0, in disagreement with our earlier result, which supported the two-center model. We have evidence that the earlier result is wrong. It also appears that in the cm. system, d 2 a/d£ldp is factorable into functions of Pj and P±. In the P ± dependence we found a very sharp forward peak of the form e ~l bP ± .