Abstract
Using a data sample collected near the resonance with the Belle detector at the KEKB asymmetric-energy collider, we observe the decay with a branching fraction of . We study the decay dynamics of and compare with . The meson is found to be almost 100% polarized (with a fraction of in the helicity zero state), while the meson has a fraction in the helicity zero state. The direct asymmetries for and are measured to be and , respectively. In addition, we report improved measurements of the branching fractions and , which supersede our previous measurements.
- Received 4 February 2008
DOI:https://doi.org/10.1103/PhysRevLett.100.251801
©2008 American Physical Society