Improved Measurement of the Pseudoscalar Decay Constant fDₛ
CLEO Collaboration · al, M. Chadha et
Original · EN
We present a new determination of the Ds decay constant, fDs 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 fDs = (280 +/- 17 +/- 25 +/- 34)MeV. We compare this result with various model calculations.
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