Weak Decays of Heavy Mesons in the Instantaneous Bethe Salpeter Approach
G. Zoeller, S. Hainzl, C. R. Muenz, M. Beyer
Abstract
In the framework of the instantaneous Bethe Salpeter equation we investigate weak decays of B and D mesons. Mesons are described as q-bar q states interacting via a mixture of a scalar and a vector confining kernel and a one gluon exchange. The model parameters are fixed by a fit to the meson mass spectrum including also the light mesons. We calculate form factors and compare our results to the pole dominance hypothesis. From a fit to ARGUS and CLEO data on B -> D* semileptonic decay we extract the Cabbibo Kobayashi Maskawa matrix element to be Vcb= (0.032+-0.003)*sqrt(1.49ps/tauB). The Isgur Wise function is calculated utilizing the heavy quark mass limit. Finally, we give some results on non-leptonic decays.
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