The semileptonic exclusive B and Ddecays on the lightfront
Abstract
We present a comprehensive account of a relativistic quark model on the light front which gives the form factors of weak hadronic currents among heavy pseudoscalar and vector mesons in the complete kinematic region 0 <= q^{2} <= q^{2}_{max}. For the numerical investigations of the B > D^{*}lν_{l}, B > πlν_{l}, D > K^{*}lν_{l} and D > πlν_{l} semileptonic decays equal time wave functions using the updates values of the ISGW model are adopted. From the available experimental information on branching fractions BR(B > D^{*} lν_{l}) and BR(B > πlν_{l}) the CKM parameters V_{cb} and V_{ub} are estimated to be V_{cb} = 0.036 +/ 0.002, V_{ub} = 0.0033 +/ 0.0005. It is show that the q^{2} distribution for the decay B > D^{*} lν_{l} will allow for an accurate test of the value of V_{cb}. The model is compared to the experimental data, QCD sum rules and lattice calculations.
 Publication:

Physics Letters B
 Pub Date:
 February 1997
 DOI:
 10.1016/S03702693(97)008836
 Bibcode:
 1997PhLB..409..435D