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    MEASUREMENT OF D MESON BRANCHING RATIOS

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    We report a measurement of the exclusive B+ meson decay to the final state D- K+π+ using 520 × 10B ̄B pairs collected near the γ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy ee collider. Using the D-S → Ø- decay mode to reconstruct D- s mesons, we obtain the branching fraction B(B+ → D-s K+π+) = (1.77+0.12-0.12(stat)±0.16(syst) ±0.23(B))×10-4. We also present preliminary results of a study of the two-body DsK, Dsπ and Kπ subsystems observed in this final state
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