We present a study of the decays B0→Ds(*)+D*-, using 20.8 fb-1 of e+e- annihilation data recorded with the BABAR detector. The analysis is conducted with a partial reconstruction technique, in which only the Ds(*)+ and the soft pion from the D*- decay are reconstructed. We measure the branching fractions B(B0→Ds+D*-)=(1.03±0.14±0.13±0.26)% and B(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+→φπ+ branching fraction uncertainty. From the B0→Ds*+D*- angular distributions, we measure the fraction of longitudinal polarization ΓL/Γ=(51.9±5.0±2.8)%, which is consistent with theoretical predictions based on factorization.
Measurement of B0→Ds(*)+D*- branching fractions and B0→Ds*+D*- polarization with a partial reconstruction technique
LO VETERE, MAURIZIO;MONGE, MARIA ROBERTA;PATRIGNANI, CLAUDIA;TOSI, SILVANO;
2003-01-01
Abstract
We present a study of the decays B0→Ds(*)+D*-, using 20.8 fb-1 of e+e- annihilation data recorded with the BABAR detector. The analysis is conducted with a partial reconstruction technique, in which only the Ds(*)+ and the soft pion from the D*- decay are reconstructed. We measure the branching fractions B(B0→Ds+D*-)=(1.03±0.14±0.13±0.26)% and B(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+→φπ+ branching fraction uncertainty. From the B0→Ds*+D*- angular distributions, we measure the fraction of longitudinal polarization ΓL/Γ=(51.9±5.0±2.8)%, which is consistent with theoretical predictions based on factorization.
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