Workshop for young scientists with research interests focused on physics at FAIR

An effective field theory for the weak ΛN-->NN interaction has been developed up to next-to-next-to leading order. The relation between the low energy constants appearing in the leading order effective field theory description 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. The calculation of the two-pion exchange diagrams and the contact operational structures contributing to next-to-leading and next-to-next-to-leading orders will also be presented.