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Published November 10, 2010 | Published
Journal Article Open

Measurement of the absolute branching fractions for D^-_s → ℓ^-ν̅_ ℓ and extraction of the decay constant f_(Ds)


The absolute branching fractions for the decays D^-_s → ℓ^- ν_ 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 D^-_s mesons is determined by reconstructing the recoiling system DKXγ in events of the type e^+e^- → DKXD^(*-)_s , where D^(*-) → D^-_s γ and X represents additional pions from fragmentation. The D^-_s → ℓ^- events are detected by full or partial reconstruction of the recoiling system DKXγℓ. The branching fraction measurements are combined to determine the D^-_s decay constant f_(ds) =(258.6 ± 6:4 ± 7.5) MeV, where the first uncertainty is statistical and the second is systematic.

Additional Information

© 2010 American Physical Society. Received 25 August 2010; published 10 November 2010. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MICIIN (Spain), STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union), the A. P. Sloan Foundation (USA), and the Binational Science Foundation (USA-Israel).

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