# Measurement of $B^0 \rightarrow D_s^{(*)+}D^{*-}$ branching fractions and polarization in the decay $B^0 \rightarrow D_s^{(*)+}D^{*-}$ with a partial reconstruction technique

Abstract : We present measurements of the decays B0->Ds(*)+D*-, using data recorded by the BABAR detector in 1999 and 2000, consisting of 20.8 fb^-1. The analysis is conducted with a partial reconstruction technique, in which only the Ds(*)+ and the soft pion from the D*- decay are reconstructed. From the observed rates, we measure the branching fractions BR(B0->Ds+D*-) = (1.03 +- 0.14 +- 0.13 +- 0.26)% and BR(B0->Ds*+D*-) = (1.97 +- 0.15 +- 0.30 +- 0.49)%, where the first error is statistical, the second is systematic, and the third is the error due to the Ds+->phi pi+ branching fraction uncertainty. From the B0->Ds*+D*- angular distributions, we measure the fraction of longitudinal polarization Gamma_L/Gamma = (51.9 +- 5.0 +- 2.8)%, which is consistent with the theoretical prediction, based on factorization. These results are preliminary.
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00013686
Contributor : Claudine Bombar <>
Submitted on : Tuesday, January 14, 2003 - 2:06:28 PM
Last modification on : Wednesday, January 6, 2021 - 6:22:02 PM

### Citation

B. Aubert, D. Boutigny, J.M. Gaillard, A. Hicheur, Y. Karyotakis, et al.. Measurement of $B^0 \rightarrow D_s^{(*)+}D^{*-}$ branching fractions and polarization in the decay $B^0 \rightarrow D_s^{(*)+}D^{*-}$ with a partial reconstruction technique. International Conference on High Energy Physics 31 ICHEP 2002, Jul 2002, Amsterdam, Netherlands. pp.1-22. ⟨in2p3-00013686⟩

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