S-P wave interference in K+K- photoproduction near K+K- threshold

A mass-dependent asymmetry was observed in the decay angular distribution of a photoproduced K+K- system near the K+K- threshold. The corresponding moments (Y10) have evaluated. Interpreting the asymmetry as an S-P wave interference due to the states S*sub(993) (0+) and phisub(1019) (1-) one can compute the moments (Y10) through an amplitude analysis. The theoretical calculation reproduces the experimental results well, if one assumes a real S-wave amplitude for the S*sub(993). The data cannot be explained by a non-resonant real S-wave. Other possibilities have been discussed. An estimate of the photoproduction cross section of the S* → K+K- can be given on the basis of the above hypothesis. (Auth.)