Abstract
We determine the weak coupling between the and quarks using a sample of events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed decays as a function of , the boost of the in the 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 , we extract the product , where is the form factor at . Combined with theoretical results for we determine .
- Received 11 March 2002
DOI:https://doi.org/10.1103/PhysRevLett.89.081803
©2002 American Physical Society