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Study of the decay ¯B0 → D*+ωπ−
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We report on a study of the decay ¯¯¯ B 0 → D * + ω π − with the BABAR detector at the PEP-II B -factory at the Stanford Linear Accelerator Center. Based on a sample of 232 × 10 6 B ¯¯¯ B decays, we measure the branching fraction B ( ¯¯¯ B 0 → D * + ω π − ) = ( 2.88 ± 0.21 ( stat . ) ± 0.31 ( syst . ) ) × 10 − 3 . We study the invariant mass spectrum of the ω π − system in this decay. This spectrum is in good agreement with expectations based on factorization and the measured spectrum in τ − → ω π − ν τ . We also measure the polarization of the D * + as a function of the ω π − mass. In the mass region 1.1 to 1.9 GeV we measure the fraction of longitudinal polarization of the D * + to be Γ L / Γ = 0.654 ± 0.042 ( stat . ) ± 0.016 ( syst . ) . This is in agreement with the expectations from heavy-quark effective theory and factorization assuming that the decay proceeds as ¯¯¯ B 0 → D * + ρ ( 1450 ) − , ρ ( 1450 ) − → ω π − .
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GRAUGÉS POUS, Eugeni and BABAR Collaboration. Study of the decay ¯B0 → D*+ωπ−. Physical Review D. 2006. Vol. 74, num. 1, pags. 012001. ISSN 1550-7998. [consulted: 21 of August of 2026]. Available at: https://hdl.handle.net/2445/131400