Study of the decay $\bar{B^0} \to D\^{*+} \omega\pi^-$

Abstract : We report on a study of the decay B0bar -> D*+ omega pi- with the BABAR detector at the PEP-II B-factory at the Stanford Linear Accelerator Center. Based on a sample of 232 million BBbar decays, we measure the branching fraction BF(B0bar -> D*+ omega pi-) = (2.88 +/- 0.21(stat.) +/- 0.31(syst.)) \times 10^{-3}. We study the invariant mass spectrum of the omega pi- system in this decay. This spectrum is in good agreement with expectations based on factorization and the measured spectrum in tau- -> omega pi- nu_tau. We also measure the polarization of the D*+ as a function of the omega pi- mass. In the mass region 1.1 to 1.9 GeV we measure the fraction of longitudinal polarization of the D*+ to be Gamma_L/Gamma = 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 B0bar -> D*+ rho(1450), rho(1450) -> omega pi-.
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Submitted on : Wednesday, January 10, 2007 - 12:59:47 PM
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Citation

B. Aubert, R. Barate, D. Boutigny, F. Couderc, y. Karyotakis, et al.. Study of the decay $\bar{B^0} \to D\^{*+} \omega\pi^-$. Physical Review D, American Physical Society, 2006, 74, pp.012001. ⟨10.1103/PhysRevD.74.012001⟩. ⟨in2p3-00084387⟩

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