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First measurement of the form factors in the decays D0→ρ- <sup>e+</sup>ν<inf>e</inf> and D+<sup>→ρ0e+</sup>ν<inf>e</inf>
Dobbs, S Metreveli, Z Seth, KK Tomaradze, A Xiao, T Martin, L Powell, A Wilkinson, G Mendez, H Asner, DM
Dobbs, S
Metreveli, Z
Seth, KK
Tomaradze, A
Xiao, T
Martin, L
Powell, A
Wilkinson, G
Mendez, H
Asner, DM
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Journal Article
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2013-03-26
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10.1103/PhysRevLett.110.131802
Abstract
The beauty to up quark coupling constant |Vub| can be extracted from B→ρe+νe combined with the form factors for D→K*e+νe and B→Vℓ+ℓ- and D→ρe+ν e. Using the entire CLEO-c ψ(3770)→DD̄ event sample, corresponding to an integrated luminosity of 818 pb-1 and approximately 5.4×106 DD̄ events, we measure the form factors for the decays D0→ρ-e+νe and D +→ρ0e+νe 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)/A 1(0)=1.48±0.15±0.05 and A2(0)/A 1(0)=0.83±0.11±0.04. Assuming Cabibbo-Kobayashi-Maskawa 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 +→ωe+νe with improved precision. © 2013 American Physical Society.
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Physical Review Letters
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