Evidence for the $b\to u$ Transition $B^0\to D_s^+ pi^-$ and a Search for $B^0\to D_s^*+ pi^-$
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We report evidence for the $b\to u$ transition $B^0 \to D_s^{+}π^-$ and the results of a search for $B^0 \to D_s^{*+} π^-$ from a sample of $61.6\times 10^6$ $Y(4S)$ decays into $B$ meson pairs collected with the BaBar detector at the PEP II asymmetric $e^{+}e^{-}$ collider.
The observed $B^0 \to D_s^{+} π^-$ yield has a probability of $4.4 \times 10^{-4}$ to be a fluctuation of the background (3.5 $σ$) and we measure the branching fraction $B^0 \to D_s^{+} π^-=3.1 \pm 1.0 ({\rm stat.})\pm 1.0 ({\rm syst.})$.
We also set a limit $B^0 \to D_s^{*+} π^- <~4.3\times 10^{-5}$ at 90% C.L.
14 pages, 5 postscript figues, submitted to FPCP (16-18 May 2002)
14 pages, 5 postscript figues, submitted to FPCP (16-18 May 2002)