Measurements of the branching fractions and helicity amplitudes inB→D*ρdecays

17 June 2003

journal article
research article
Published by American Physical Society (APS) in Physical Review D

Vol. 67 (11) , 112002
https://doi.org/10.1103/physrevd.67.112002

Abstract

Using

9.1 {fb}^{- 1}

e^{+} e^{-}

data collected at the

Υ (4 S)

with the CLEO detector using the Cornell Electron Storage Ring, measurements are reported for both the branching fractions and the helicity amplitudes for the decays

B^{-} \to D^{* 0} ρ^{-}

and

B^{0} \to D^{* +} ρ^{-} .

The fraction of longitudinal polarization in

B^{0} \to D^{* +} ρ^{-}

is found to be consistent with that in

B^{0} \to D^{* +} l^{-} \bar{ν}

q^{2} {= M}_{ρ}^{2},

indicating that the factorization approximation works well. The longitudinal polarization in the

B^{-}

mode is similar. The measurements also show evidence of nontrivial final-state interaction phases for the helicity amplitudes.

Keywords

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