On the Migdal-Watson approach to FSI effects in Meson production in NN collisions

The influence of the the nucleon-nucleon final-state interaction (FSI) on p roperties of the meson-production amplitude near threshold is discussed. Fo r nucleon-nucleon interaction, a simple Yamaguchi potential and realistic p otential models art: considered. It is shown that FSI effects cannot be fac torized from tile production amplitude. The absolute magnitude of FSI effec ts depends on the momentum transfer (or on the mass of the produced meson) and hence is not universal. Only in the case of the production of rather he avy mesons like eta' or phi FSI do effects become universal. The Jest funct ion approach to FSI effects is critically examined. (C) 2001 MAIK "Nauka/In terperiodica".