Measurement of the ratio Beta(D+ -> pi(0)l+nu) Beta(D+ -> (K)over-bar(o)l+nu)
Ammar, Raymond G.
Baringer, Philip S.
Davis, Robin E. P.
AMERICAN PHYSICAL SOC
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Using the CLEO-II detector, the branching ratio of the Cabibbo suppressed decay D+ --> pi0l+nu, relative to the branching ratio of the Cabibbo favored decay D+ --> K0l+nuBAR, is measured to be B(D+ --> pi0l+nu)/B(D+ --> K0l+nuBAR) = (8.5 +/- 2.7 +/- 1.4)%. From this ratio, the product of the ratio of Cabibbo-Kobayashi-Maskawa (CKM) matrix elements, \V(cd)/V(cs)\2, and the form factors at q2 = 0, \f+pi(0)/f+K(0)\2, is determined to be \V(cd)/V(cs)\2\f+pi(0)/f+K(0)\2 = 0.085 +/- 0.027 +/- 0.014.
ALAM, MS, KIM, IJ, et al. Measurement of the ratio Beta(D+ -> pi(0)l+nu) Beta(D+ -> (K)over-bar(o)l+nu). PHYSICAL REVIEW LETTERS. August 1993. 71(9) : 1311-1315
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