Factorization in Color-Favored B Meson Decays to Charm

Abstract

Improved $B$ meson decay data have permitted more incisive tests of factorization predictions. A concurrent benefit is the ability to constrain the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$. Using a simultaneous fit to differential distributions $d Γ(\ob \to D^{*+} l^- \bar ν_l)/ dq^2$ measured by the CLEO and LEP Collaborations, the rates for the color-favored decays $\ob \to D^{(*)+} (π^-,ρ^-,a_1^-)$, and the rate for $\ob \to D^+ l^- \bar ν_l$, we find $|V_{cb}|=0.0415\pm 0.0022$. The slope of the universal Isgur-Wise form factor is described by a parameter found to be $\rs = 1.52 \pm 0.11$. Taking the $D_s$ meson decay constant from the world average of direct measurements, we predict satisfactorily the branching ratios for $\ob \to D^{(*)+} D_s^{(*)-}$. Ratios of helicity amplitudes for color-favored processes are also found to be in accord with predictions.

17 pages, LaTeX, 5 figures, submitted to Phys. Rev. D, revised version, semileptonic $B\to$D spectrum included in fit

References in corpus (1)

• Measurement of V_{cb} from the decay process \bar{B^0} -> D^{*+} \ell^- \barν

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• Study of B --> D^(*)D_s(J)^(*) Decays and Measurement of D_s^- and D_sJ(2 460)^- Branching Fractions
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• Nonleptonic Weak Decays of B to D_s and D mesons
• Factorization and polarization in two charmed-meson B decays
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• Small amplitude effects in $B^0\to D^{+}{D}^{-}$ and related decays
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• Measurement of B0->D_s(*)+D*- Branching Fractions and B0->D_s*+D*- Polarization with a Partial Reconstruction Technique
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• Obtaining CKM Phase Information from B Penguin Decays
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• A Measurement of gamma from the Decays Bd(t) -> D(*)+ D(*)- and Bd -> Ds(*)+ D(*)-
• Test of Factorization Hypothesis from Exclusive Non-leptonic B decays
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• On three-body B decays to charm