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

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

1997-12-11

arxiv.org/abs/hep-ex/9712014v2

Phys.Rev.D58:032002,1998

Physics

High Energy Physics

High Energy Physics - Experiment

23 page postscript file, postscript file also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1103/PhysRevD.58.032002

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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