Improved measurement of the pseudoscalar decay constant fDs

M. Chada et al. (CLEO Collaboration)
Phys. Rev. D 58, 032002 – Published 22 June 1998
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Abstract

We present a new determination of fDs using 5 million e+ecc¯ events obtained with the CLEO II detector. Our value is derived from our new measured ratio Γ(Ds+μ+ν)/Γ(Ds+φπ+)=0.173±0.023±0.035. Using B(Ds+φπ+)=(3.6±0.9)%, we extract fDs=(280±19±28±34)MeV. We compare this result with various model calculations.

  • Received 10 December 1997

DOI:https://doi.org/10.1103/PhysRevD.58.032002

©1998 American Physical Society

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Vol. 58, Iss. 3 — 1 August 1998

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