ANALYSIS OF THE DECAY B-]D-ASTERISK-XL(NU-L)OVER-BAR WITH PREDICTIONSFROM HEAVY-QUARK AND CHIRAL-SYMMETRY

This paper considers the implications of the heavy quark and chiral sy mmetries for the semileptonic decay B --> DXlv(l)BAR. The general kin ematic analysis for decays of the form pseudoscalar meson --> vector m eson + pseudoscalar meson + lepton + antilepton is presented. This for malism is applied to the above exclusive decay which allows the differ ential decay rate to be expressed in a form that is ideally suited for the experimental determination of the different form factors for the process through angular distribution measurements. Heavy quark and chi ral symmetry predictions for the form factors are presented, and the d ifferential decay rate is calculated in the kinematic region where chi ral perturbation theory is valid.