Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-12-22
Phys.Rev. D58 (1998) 053001
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 4 figures, RevTeX
Scientific paper
10.1103/PhysRevD.58.053001
In the framework of a relativistic covariant Bethe-Salpeter model for the quark-antiquark system we present a renewed determination of the Cabbibo-Kobayashi-Maskawa matrix element $|V_{cb}|$. Complementing an earlier analysis applied to the whole decay spectrum for $B\to D^* e\nu$ we now also employ the ``zero-recoil method'' that uses the end point of the decay spectrum ($\omega=1$) and is suited for heavy-to-heavy transitions. The averaged experimental value extracted from the data at zero recoil, $|V_{cb}|{\cal F}(\omega=1)=0.0343\pm0.0015$, then leads to $|V_{cb}|=0.0360\pm 0.0016$. This value is somewhat larger than the one that uses the whole decay spectrum for the model analysis. We also contrast this result to a nonrelativistic model and to recent experiments on the $B\to D e\nu$ semileptonic decay.
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