The main goal of this talk is to review a new method’ for predicting, from QCD, the weak matrix elements that are needed to describe the semileptonic decays; B -+ DePe,,B + D’ec, and Ab + A,eti,. The method also relates B + pe& semileptonic decay to D + pZuc semileptonic decay. Since these are exclusive decays involving hadronic states nonperturbative strong interaction physics plays a role. Th...

The FINUDA experiment, carried out at the Frascati φ-factory DAΦNE, allowed to find the first experimental evidence for the existence of the neutron-rich hypernucleus ΛH by measuring in coincidence (π+,π−) pairs from the K− stop + Li → ΛH + π production reaction, followed by the ΛH → He + π− mesonic weak decay. The production rate of ΛH undergoing such a two-body π− decay turned out to be (2.9 ...