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Measurement of the absolute branching fractions for D-s(-) --> l(-) (nu)over-bar(l) and extraction of the decay constant f(Ds)

Author(s)
Dujmic, Denis; Sciolla, Gabriella; Zhao, M.; Cowan, Ray F
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Alternative title
Measurement of the absolute branching fractions for Ds-→ℓ-ν̅ ℓ and extraction of the decay constant fDs
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
The absolute branching fractions for the decays Ds--->ℓ-[nu] ℓ (ℓ=e, mu, or tau) 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-[nu]ℓ 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.
Date issued
2010-11
URI
http://hdl.handle.net/1721.1/64622
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review D
Publisher
American Physical Society
Citation
BABAR Collaboration et al. "Measurement of the absolute branching fractions for Ds--->ℓ-nu ℓ and extraction of the decay constant fDs." Phys. Rev. D 82.9, 091103(R)(2010)[8 pages] © 2010 The American Physical Society.
Version: Final published version
ISSN
1550-7998
1550-2368

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