Improved Measurement of the Pseudoscalar Decay Constant $f_{D_{s}}$

CLEO Collaboration; M. Chadha et al

arxiv: hep-ex/9712014 · v2 · submitted 1997-12-11 · ✦ hep-ex

Improved Measurement of the Pseudoscalar Decay Constant f_{D_(s)}

CLEO Collaboration , M. Chadha et al This is my paper

classification ✦ hep-ex

keywords constantdecayratiobranchingcalculationscharmcleocompare

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We present a new determination of the Ds decay constant, f_{Ds} using 5 million continuum charm events obtained with the CLEO II detector. Our value is derived from our new measured ratio of widths for Ds -> mu nu/Ds -> phi pi of 0.173+/- 0.021 +/- 0.031. Taking the branching ratio for Ds -> phi pi as (3.6 +/- 0.9)% from the PDG, we extract f_{Ds} = (280 +/- 17 +/- 25 +/- 34){MeV}. We compare this result with various model calculations.

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