Measurement of the absolute branching fractions for D_{s}^{-}→ℓ^{-}ν[over ¯]_{ℓ} and extraction of the decay constant f_{D_{s}}

del Amo Sanchez, P. et al. (2010) Measurement of the absolute branching fractions for D_{s}^{-}→ℓ^{-}ν[over ¯]_{ℓ} and extraction of the decay constant f_{D_{s}}. Physical Review D, 82 (9). 091103. ISSN 1550-7998

Abstract

The absolute branching fractions for the decays Ds-→ℓ-ν̅ ℓ (ℓ=e, μ, or τ) are measured using a data sample corresponding to an integrated luminosity of 521 fb-1 collected at center-of-mass energies near 10.58 GeV with the BABAR detector at the PEP-II e+e- collider at SLAC. The number of Ds- mesons is determined by reconstructing the recoiling system DKXγ in events of the type e+e-→DKXDs*-, where Ds*-→Ds-γ and X represents additional pions from fragmentation. The Ds-→ℓ-νℓ events are detected by full or partial reconstruction of the recoiling system DKXγℓ. The branching fraction measurements are combined to determine the Ds- decay constant fDs=(258.6±6.4±7.5) MeV, where the first uncertainty is statistical and the second is systematic.

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