We reanalyze the decay constants of s-wave and p-wave mesons and D, B → M form factors, where M represents a pseudoscalar meson, a vector meson, a scalar meson, or an axial vector meson within a covariant light-front quark model. The parameter β for wave-functions of most of s-wave mesons and of a few axial-vector mesons are fixed with latest experimental information, wherever available or using the lattice calculations. The treatment of masses and mixing angles for strange axial vector mesons is improved for the purpose. We extend our analysis to determine the form factors appearing in the transition of D s , B s → M transitions, and to the isoscalar final state mesons. Numerical results of the form factors for transitions between a heavy pseudoscalar meson and an s-wave or p-wave light meson and their momentum dependence are presented in detail. Further, their sensitivity to uncertainties of β parameters of the initial as well as the final mesons is investigated. Some experimental measurements of the charmed and bottom meson decays are employed to compare the decay constants and transition form factors obtained in this and other works.

In view of recent experimental trends we investigate the weak nonleptonic decays of charm baryons within the framework of the constituent quark model. Branching ratios and asymmetry parameters for all $++i++O-charm-changing modes are calculated with appropriate QCD corrections. The effect of flavor dependence on the scale is found to be quite significant.

We study two-body weak hadronic decays of ψ and Υ employing the factorization scheme. Branching ratios for ψ → P P/P V and Υ → P P/P V decays in the Cabibboangle-enhanced and Cabibbo-angle-suppressed modes are predicted. Int. J. Mod. Phys. A 1999.14:937-945. Downloaded from www.worldscientific.com by QUEEN'S UNIVERSITY on 02/04/15. For personal use only.

We carry out a detailed analysis of effects of flavor dependence of average transverse quark momentum inside a meson onJ/ψ→Pandϒ→Bctransition form factors and two-body weak hadronic decays ofJ/ψandϒemploying the factorization scheme. We predict the branching ratios of semileptonic and nonleptonic weak decays ofJ/ψandϒmesons in Cabibbo-angle-enhanced and Cabibbo-angle-suppressed modes.

We study two-body weak decays of charmed baryons ⌳ c ϩ , ⌶ c ϩ , and ⌶ c 0 into an octet or decuplet baryon and a pseudoscalar meson employing the SU͑3͒ flavor symmetry. Using certain measured Cabibbo-favored modes, we fix the reduced amplitudes and predict the branching ratios of various decays of charmed baryons in the Cabibbo-enhanced, -suppressed, and -doubly-suppressed modes. ͓S0556-2821͑97͒01211-3͔