Abstract
The spectra of exclusive semi-leptonic decays of heavy b-quark and c-quark mesons are derived, taking account of confined effects of quarks in the covariant oscillator quark model (COQM). The respective partial widths are also calculated using the standard values of KM-matrix elements. In COQM all kinematics and effective interactions are expressed in a manifestly covariant and unified way. The effective weak currents are given as overlapping integrals between initial and final hadron “wave functions” and lead to the many relations among the form factors, including those derived by HQET in the case of heavy-light quark meson systems. On the other hand, for reference the values of the relevant KM-matrix elements, estimated in COQM directly from each experimental decay width, are also given.
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