K{sup -3}He and K{sup +}K{sup -} interactions in the pd{yields} {sup 3}He K{sup +}K{sup -} reaction

We investigate the K{sup -} {sup 3}He and K{sup +}K{sup -} interactions in the reaction pd{yields} {sup 3}He K{sup +}K{sup -} near threshold and compare our model calculations with data from the MOMO experiment at COSY-Juelich. A large attractive effective K{sup -}p amplitude would give a significant K{sup -} {sup 3}He final-state interaction effect, which is not supported by the experimental data. We also estimate upper limits for the a{sub 0}(980) and f{sub 0}(980) contributions to the produced K{sup +}K{sup -} pairs.