Analysis of data for hypercharge-exchange reactions

The properties of the experimental data on the hypercharge- exchange reactions pi N to K Sigma , K Lambda and KN to pi Sigma , pi Lambda in the region (4/16)GeV/c are surveyed, with attention to line-reversal inequalities, reaction energy dependences in terms of effective trajectories, phase-energy properties, and SU/sub 3/ for exchanges. The s-channel helicity nonflip amplitudes at 4 and 14 GeV/c are determined, assuming an exchange degenerate K/sub V/*-K/sub T/* Regge- pole approximation for the flip amplitudes. In the impact-parameter representation only the imaginary parts of the pi N to KY nonflip amplitudes (or in terms of exchanges Im K/sub V/*) are found to be peripheral. All other nonflip amplitude components are central. An SU /sub 3/ comparison is made with K/sup -/p to eta Lambda , eta ' Lambda data. (28 refs).