Observation of tree-level B decays with $s\bar{s}$ Production from Gluon Radiation

Abstract

We report on our search for $B^{-}\to D_s^{(\ast )+}{K}^{-}{\pi }^{-}$, $\overline{B^0}\to D_s^{(\ast )+}{K}_S^0{\pi }^{-}$, and $B^{-}\to D_s^{(\ast )+}{K}^{-}{K}^{-}$ decays in 383 million $\FourS \to B \Bbar$ events collected by the Babar detector at the PEP2 asymmetric-energy $B$-factory. The decays proceed via a tree-level $b\to c$ quark transition in which a gluon radiates into an $s\bar{s}$ pair. Their branching fractions are measured to be $\mathcal{B}(B^{-}\to D_s^{+}{K}^{-}{\pi }^{-})=(2.02\pm 0.13_{stat}\pm 0.38_{syst})\times 10^{-4},$ $\mathcal{B}(B^{-}\to D_s^{\ast +}{K}^{-}{\pi }^{-})=(1.67\pm 0.16_{stat}\pm 0.35_{syst})\times 10^{-4},$ $\mathcal{B}(\overline{B^0}\to D_s^{+}{K}_S^0{\pi }^{-})=(0.55\pm 0.13_{stat}\pm 0.10_{syst})\times 10^{-4},$ and $\mathcal{B}(B^{-}\to D_s^{+}{K}^{-}{K}^{-})=(0.11\pm 0.04_{stat}\pm 0.02_{syst})\times 10^{-4}$. Upper limits at the 90% C.L. are set on $\mathcal{B}(\overline{B^0}\to D_s^{\ast +}{K}_S^0{\pi }^{-})<0.55\times 10^{-4}$ and $\mathcal{B}(B^{-}\to D_s^{\ast +}{K}^{-}{K}^{-})<0.15\times 10^{-4}$. We present evidence that the invariant mass distributions of $D_s^{(\ast )+}{K}^{-}$ pairs from $B^{-}\to D_s^{(\ast )+}{K}^{-}{\pi }^{-}$ decays are inconsistent with the phase-space model, suggesting the presence of charm resonances lying below the $D_s^{(\ast )+}{K}^{-}$ threshold.

7 pages, 9 postscript figures, submitted to PRL

References in corpus (6)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• Study of B- => D**0 pi-(D**0 => D(*)+ pi-) decays
• B Meson Decays to eta(')K*, eta(')rho,eta(')pi0, omegapi0, and phipi0
• Study of Inclusive B- and Bbar0 Decays to Flavor-Tagged D, D_s and Lambda_c
• The role of $D^{\star \star }$ in $B^{-}\to D_s^{+}{K}^{-}{\pi }^{-}$

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