Measurement of the absolute branching fractions for D-s(-) --> l(-) (nu)over-bar(l) and extraction of the decay constant f(Ds)
Author(s)Cowan, Ray Franklin; Dujmic, Denis; Sciolla, Gabriella; Zhao, M.
Measurement of the absolute branching fractions for Ds-→ℓ-ν̅ ℓ and extraction of the decay constant fDs
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review D
American Physical Society
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.
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