Within the generalized factorization scheme, we study extracting (Formula presented) by calculating the ratios (Formula presented) including penguin effects. The ratios involving the (Formula presented) mode have considerable penguin corrections (Formula presented) at the amplitude level), but those involving the (Formula presented) mode have relatively small penguin corrections. On the other hand, the (Formula presented) mode has a smaller form-factor dependence. Therefore, these ratios complement each other in measuring (Formula presented) The theoretical uncertainty from the hadronic form factors in our method is at the level of 20%, which is comparable to the model dependence uncertainty of about 20% in the measurement of (Formula presented) from the exclusive semileptonic B decays. Using the newest upper limit on (Formula presented) decay from CLEO, our method sets an upper limit (Formula presented) which is very close to the measured values from the semileptonic B decays.
|Number of pages||1|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 2001|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)