Measurement of the branching fractions of the rare decays B0→D(*)+sπ−, B0→D(*)+sρ−, and B0→D(*)−sK(*)+

Abstract

We report the measurement of the branching fractions of the rare decays B 0 → D ( * ) + s π − , B 0 → D ( * ) + s ρ − , and B 0 → D ( * ) − s K ( * ) + in a sample of 381 × 10 6 Υ ( 4 S ) decays into B ¯¯¯ B pairs collected with the BABAR detector at the PEP-II asymmetric-energy e + e − storage ring. We present evidence for the decay B 0 → D − s K * + and the vector-vector decays B 0 → D * + s ρ − and B 0 → D * − s K * + , as well as the first measurement of the vector meson polarization in these decays. We also determine the ratios of the CKM-suppressed to CKM-favored amplitudes r ( D ( * ) π ) and r ( D ( * ) ρ ) in decays B 0 → D ( * ) ± π ∓ and B 0 → D ( * ) ± ρ ∓ , and comment on the prospects for measuring the C P observable sin  ( 2 β + γ ) .