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Study of inclusive DS((*)+/-) production in B decays and measurement of B0 --> D(*-)DS((*)+) decays using a partial reconstruction technique

Abstract

Electron-positron annihilation data collected by the BABAR detector near the Y(4S) resonance are used to study the inclusive decay of B mesons to DS(+/-) and DS(*+/-) mesons, where the DS(+/-) is reconstructed using the decay DS(+/-) --> phi pi(+/-). The production fraction of inclusive DS((*)+/-) and the corresponding momentum spectra have been determined. The exclusive decays B0 --> D(*-)DS((*)+) are observed with a partial reconstruction technique which uses the soft pion from the D(*+/-) decay in association with the reconstructed DS((*)+/-). The beam energy constraint is used to determine the missing mass recoiling against the DS(+/-) system, showing a clear signal for this process. From the observed rates, preliminary results for the corresponding branching fractions have been obtained.

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