First Measurement of the Form Factors in the Decays D0 to rho- e+ nue and D+ to rho0 e+ nue
Abstract
Using the entire CLEO-c psi(3770) to DDbar event sample, corresponding to an integrated luminosity of 818 pb-1 and approximately 5.4 x 106 DDbar events, we measure the form factors for the decays D0 to rho- e+ nue and D+ to rho0 e+ nue for the first time and the branching fractions with improved precision. A four-dimensional unbinned maximum likelihood fit determines the form factor ratios to be: V(0)/A1(0) = 1.48 +- 0.15 +- 0.05 and A2(0)/A1(0)= 0.83 +- 0.11 +- 0.04. Assuming CKM unitarity, the known D meson lifetimes and our measured branching fractions we obtain the form factor normalizations A1(0), A2(0), and V(0). We also present a measurement of the branching fraction for D+ to omega e+ nue with improved precision.
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