Using [Formula Presented] of [Formula Presented] data collected at the [Formula Presented] 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 [Formula Presented] and [Formula Presented] The fraction of longitudinal polarization in [Formula Presented] is found to be consistent with that in [Formula Presented] at [Formula Presented] indicating that the factorization approximation works well. The longitudinal polarization in the [Formula Presented] mode is similar. The measurements also show evidence of nontrivial final-state interaction phases for the helicity amplitudes.

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Journal Physical Review D - Particles, Fields, Gravitation and Cosmology
Csorna, S.E. (S. E.), Danko, I. (I.), Bonvicini, G. (G.), Cinabro, D. (D.), Dubrovin, M. (M.), McGee, S. (S.), … Mahmood, A.H. (A. H.). (2003). Measurements of the branching fractions and helicity amplitudes in [Formula Presented] decays. Physical Review D - Particles, Fields, Gravitation and Cosmology, 67(11). doi:10.1103/PhysRevD.67.112002