  The relation between the low energy constants appearing in the effective
field theory description of the \Lambda N --> N N transition potential and the
parameters of the one-meson-exchange model previously developed are obtained.
We extract the relative importance of the different exchange mechanisms
included in the meson picture by means of a comparison to the corresponding
operational structures appearing in the effective approach. The ability of this
procedure to obtain the weak baryon-baryon-meson couplings for a possible
scalar exchange is also discussed.
