CHINESE CTR ADV SCI & TECHNOL,WORLD LAB,CTR THEORET PHYS,BEIJING,PEOPLES R CHINA
We propose meson wave functions and discuss their properties, such as the moments and the average transverse momenta. We also modify the Bauer-Stech-Wirbel (BSW) model by applying these wave functions to exclusive decays of D and B mesons. Comparisons between our results and those of BSW are given. An upper limit of V(ub) which is smaller than that of the BSW model is found.