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In the framework of a relativistic covariant Bethe-Salpeter model for thequark-antiquark system we present a renewed determination of theCabbibo-Kobayashi-Maskawa matrix element $|V_{cb}|$. Complementing an earlieranalysis applied to the whole decay spectrum for $B\to D^* e\nu$ we now alsoemploy the ``zero-recoil method'' that uses the end point of the decay spectrum($\omega=1$) and is suited for heavy-to-heavy transitions. The averagedexperimental value extracted from the data at zero recoil, $|V_{cb}|{\calF}(\omega=1)=0.0343\pm0.0015$, then leads to $|V_{cb}|=0.0360\pm 0.0016$. Thisvalue is somewhat larger than the one that uses the whole decay spectrum forthe model analysis. We also contrast this result to a nonrelativistic model andto recent experiments on the $B\to D e\nu$ semileptonic decay.Comment: 7 pages, 4 figures, RevTe

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Determination of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>|</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi>V</mml:mi></mml:mrow><mml:mrow><mml:mi>cb</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mi>|</mml:mi></mml:math>from exclusive decays in a relativistic quark model

Determination of|Vcb|from exclusive decays in a relativistic quark model