Abstract
We report on a study of the decay with the BABAR detector at the PEP-II -factory at the Stanford Linear Accelerator Center. Based on a sample of decays, we measure the branching fraction . We study the invariant mass spectrum of the system in this decay. This spectrum is in good agreement with expectations based on factorization and the measured spectrum in . We also measure the polarization of the as a function of the mass. In the mass region 1.1 to 1.9 GeV we measure the fraction of longitudinal polarization of the to be . This is in agreement with the expectations from heavy-quark effective theory and factorization assuming that the decay proceeds as , .
2 More- Received 4 April 2006
DOI:https://doi.org/10.1103/PhysRevD.74.012001
©2006 American Physical Society