The weak decays of charmed particles and τ-lepton in the chiral model

The weak decays of the charmed particles- Λ+c-baryons and D-mesons and τ-lepton are studied in the framework of the phenomenological chiral Lagrangian method. Λ+c →Σ+π+π-, nK-π+π- decays and the factors suppressing these decays are analyzed. It is shown that this Lagrangian allows to define all decay channels with factors characterizing their intensities. It was shown that chiral model is powerful for describing semileptonic decays of D-mesons. Decays of τ-lepton are described with taking into account the isotopic breaking of chiral symmetry. Obtained results are compared with available theoretical and experimental data.(author)