| Abstract |
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Abstract
We present model-independent measurements of the branching fractions
B(B0 -> D_s*+ D*-) and B(D_s+ -> phi pi+) based on 19.3 fb-1 of data
collected by the BABAR detector at the PEP-II e+e- B Factory.
Neutral B-meson decays to the D_s*+ D*- final state are
selected with a partial reconstruction of the D_s*+; that is, only the
D*- and the soft photon from the decay D_s*+ -> D_s+ gamma
are reconstructed. The branching fraction B(B0 -> D_s*+ D*-) is
extracted from these event yields, while B(D_s+ -> phi pi+) is determined by
combining this result with a previous measurement of the product
B(B0 -> D_s*+ D*-) x B(D_s+ -> phi pi+) with partial reconstruction
of the D*-. We obtain the following preliminary results:
B(B0 -> D_s*+ D*-) = (1.50 +/- 0.16 +/- 0.12)%,
B(D_s+ -> phi pi+) = (4.7 +/- 0.6 +/- 0.8)%
where the first error is statistical, and the second systematic.
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