Leptonic and semileptonic decays of mesons in the Domain model of QCD vacuum

The leptonic and semileptonic decays of mesons are investigated within the Domain model of QCD vacuum and hadronization. The Domain Model is the mean-field approach based on the statistical ensemble of almost everywhere homogeneous Abelian (anti-)self-dual gluon fields which reproduces main features of low-energy QCD and allows to deduce a nonlocal effective meson action. Using this meson action, the leptonic decay constants, form factors and branching ratios of semileptonic decays are evaluated simultaneously with masses of mesons. The results are compared to experimental data or other approaches.