Published in:

Physical Review D 77,11 (2008)

Abstract

Using a sample of 1.8 million D (D) over bar mesons collected at the psi(3770) with the CLEO-c detector, we study the semileptonic decays D-0 ->pi(-)e(+)nu(e), D+ -> pi(0)e(+)nu(e), D-0 -> K(-)e(+)nu(e), and D+ -> (K) over bar (0)e(+)nu(e). For the total branching fractions we find B(D-0 ->pi(-)e(+)nu(e))=0.299(11)(9)%, B(D+ -> pi(0)e(+)nu(e))=0.373(22)(13)%, B(D-0 -> K(-)e(+)nu(e))=3.56(3)(9)%, and B(D+ -> (K) over bar (0)e(+)nu(e))=8.53(13)(23)%, where the first error is statistical and the second systematic. In addition, form factors are studied through fits to the partial branching fractions obtained in five q(2) ranges. By combining our results with recent unquenched lattice calculations, we obtain |V-cd| = 0.217(9)(4)(23) and |V-cs| = 1.015(10)(11)(106), where the final error is theoretical.

Keywords

Astronomy & Astrophysics;; Physics, Particles & Fields

Date of this Version

January 2008

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