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Abstract
Because quarks in hadronic states are subjected to strong QCD forces, it is not straight-forward
to apply calculation obtained at the quark level to physical processes involving hadrons.
In this paper we present a new approach to treat the semileptonic decays of pseudoscalar
mesons. At the quark level, the process is straightforward. However, when we fold
the quark-level process to the meson decay process, the complication from QCD effects
come in. We make the fundamental assumption that the vertex of type M-q-qbar can be
approximated by an effective constant gamma-5 coupling. With this assumption, the
hadronic process can then be related to the quark-level process. The model is applied
to the semileptonic decays of pi, K, D and B mesons.