Measurements of B --> D_s^{(*)+} D^{*(*)} Branching Fractions

Abstract

This article describes improved measurements by CLEO of the $B^0\to D_s^{+}{D}^{\ast -}$ and $B^0\to D_s^{\ast +}{D}^{\ast -}$ branching fractions, and first evidence for the decay $B^{+}\to D_s^{(\ast )+}{\bar{D}}^{\ast \ast 0}$, where ${\bar{D}}^{\ast \ast 0}$ represents the sum of the ${\bar{D}}_1(2420{)}^0$, ${\bar{D}}_2^{\ast }(2460{)}^0$, and ${\bar{D}}_1(j=1/2{)}^0$ L=1 charm meson states. Also reported is the first measurement of the $D_s^{\ast +}$ polarization in the decay $B^0\to D_s^{\ast +}{D}^{\ast -}$. A partial reconstruction technique, employing only the fully reconstructed $D_s^{+}$ and slow pion ${\pi }_s^{-}$ from the $D^{\ast -}\to {\bar{D}}^0{\pi }_s^{-}$ decay, enhances sensitivity. The observed branching fractions are $\mathcal{B}(B^0\to D_s^{+}{D}^{\ast -})=(1.10\pm 0.18\pm 0.10\pm 0.28)$, $\mathcal{B}(B^0\to D_s^{\ast +}{D}^{\ast -})=(1.82\pm 0.37\pm 0.24\pm 0.46)$, and $\mathcal{B}(B^{+}\to D_s^{(\ast )+}{\bar{D}}^{\ast \ast 0})=(2.73\pm 0.78\pm 0.48\pm 0.68)$, where the first error is statistical, the second systematic, and the third is due to the uncertainty in the $D_s^{+}\to \varphi {\pi }^{+}$ branching fraction. The measured $D_s^{\ast +}$ longitudinal polarization, ${\Gamma }_L/\Gamma =(50.6\pm 13.9\pm 3.6)$, is consistent with the factorization prediction of 54%.

arXiv comment26 pages (LaTeX), 15 figures. To be submitted to PRD

References in corpus (7)

• Heavy Quark Symmetry
• Strong Decays of Excited Heavy Mesons In Chiral Perturbation Theory
• Nonleptonic Decays and Lifetimes of b-quark and c-quark Hadrons
• The Subleading Isgur-Wise Form Factor ${\xi }_3(v\cdot v^{\prime })$ and its Implications for the Decays $\bar{B}\to D^{(\ast )}\ell \bar{\nu }$
• Production and Decay of D_1(2420)^0 and D_2^*(2460)^0
• A New Measurement of $B\to D^{\ast }\pi$ Branching Fractions
• First Observation of the Decay $B^0\to D^{\ast +}{D}^{\ast -}$

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• Study of B --> D^(*)D_s(J)^(*) Decays and Measurement of D_s^- and D_sJ(2 460)^- Branching Fractions
• Measurements of the Branching Fractions and Helicity Amplitudes in B --> D* rho Decays
• Measurement of Ds+ and Ds*+ Production in B Meson Decays and from Continuum e+e- Annihilation at sqrt{s}=10.6 GeV
• Measurement of B0->D_s(*)+D*- Branching Fractions and B0->D_s*+D*- Polarization with a Partial Reconstruction Technique
• Observation of the decay B^0->D+D*-
• Studying Double Charm Decays of B_{u,d} and B_{s} Mesons in the MSSM with R-parity Violation
• Angular analysis of $B^0\to D^{\ast -}{D}_s^{\ast +}$ with $D_s^{\ast +}\to D_s^{+}\gamma$ decays