Abstract
Using the recent experimental data of and various model calculations on form factors, we reanalyze the effective coefficients and and their ratio. QCD and electroweak penguin corrections to from and from are estimated. In addition to the model-dependent determination, the effective coefficient is also extracted in a model-independent way as the decay modes are related by factorization to the measured semileptonic distribution of at . Moreover, this enables us to extract model-independent heavy-to-heavy form factors, for example, and . The determination of the magnitude of from depends on the form factors and at . By requiring that be process insensitive (i.e., the value of extracted from and states should be similar), as implied by the factorization hypothesis, we find that form factors are severely constrained; they respect the relation . Form factors and at inferred from the measurements of the longitudinal polarization fraction and the P-wave component in are obtained. A stringent upper limit on is derived from the current bound on and it is sensitive to final-state interactions.
- Received 5 November 1998
DOI:https://doi.org/10.1103/PhysRevD.59.092004
©1999 American Physical Society