Determination of the [Formula Presented] decay width and [Formula Presented]

N. E. Adam, J. P. Alexander, C. Bebek, B. E. Berger, K. Berkelman, F. Blanc, V. Boisvert, D. G. Cassel, P. S. Drell, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, L. Hsu, C. D. Jones, J. KandaswamyD. L. Kreinick, A. Magerkurth, H. Mahlke-Krüger, T. O. Meyer, N. B. Mistry, E. Nordberg, M. Palmer, J. R. Patterson, D. Peterson, J. Pivarski, D. Riley, A. J. Sadoff, H. Schwarthoff, M. R. Shepherd, J. G. Thayer, D. Urner, B. Valant-Spaight, G. Viehhauser, A. Warburton, M. Weinberger

Research output: Contribution to journalArticlepeer-review


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 (Formula presented) using a sample of (Formula presented) (Formula presented) events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed (Formula presented) and (Formula presented) decays as a function of w, the boost of the (Formula presented) in the B rest frame, and from this we obtain the differential decay rate (Formula presented) By extrapolating (Formula presented) to (Formula presented) the kinematic end point at which the (Formula presented) is at rest relative to the B, we extract the product (Formula presented) where (Formula presented) is the form factor at (Formula presented) We find (Formula presented) We combine (Formula presented) with theoretical results for (Formula presented) to determine (Formula presented) We also integrate the differential decay rate over w to obtain (Formula presented) and (Formula presented)

Original languageEnglish (US)
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number3
StatePublished - 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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