Abstract
In the standard model, the charged current of the weak interaction is governed by a unitary quark mixing matrix that also leads to CP violation. Measurement of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements is essential to searches for new physics, either through the structure of the CKM matrix, or a departure from unitarity. We determine the CKM matrix element using a sample of events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed and decays as a function of w, the boost of the in the B rest frame, and from this we obtain the differential decay rate By extrapolating to the kinematic end point at which the is at rest relative to the B, we extract the product where is the form factor at We find We combine with theoretical results for to determine We also integrate the differential decay rate over w to obtain and
- Received 14 October 2002
DOI:https://doi.org/10.1103/PhysRevD.67.032001
©2003 American Physical Society