Measurement of the Absolute Branching Fraction of $D_{s}^{+} \to τ^{+} ν_{τ}$ Decay

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21 April 2008

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 100 (16) , 161801
https://doi.org/10.1103/physrevlett.100.161801

Abstract

Using a sample of tagged

D_{s}^{+}

decays collected near the

D_{s}^{* \pm} D_{s}^{\mp}

peak production energy in

e^{+} e^{-}

collisions with the CLEO-c detector, we study the leptonic decay

D_{s}^{+} \to τ^{+} ν_{τ}

via the decay channel

τ^{+} \to e^{+} ν_{e} {\bar{ν}}_{τ}

. We measure

B (D_{s}^{+} \to τ^{+} ν_{τ}) = (6.17 \pm 0.71 \pm 0.34) %

, where the first error is statistical and the second systematic. Combining this result with our measurements of

D_{s}^{+} \to μ^{+} ν_{μ}

and

D_{s}^{+} \to τ^{+} ν_{τ}

(via

τ^{+} \to π^{+} {\bar{ν}}_{τ}

), we determine

f_{D_{s}} = (274 \pm 10 \pm 5) MeV

.

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This publication has 19 references indexed in Scilit:

High-Precision Determination of the $π$ , $K$ , $D$ , and $D_{s}$ Decay Constants from Lattice QCD
Physical Review Letters, 2008
Effect of $H^{\pm}$ on $B^{\pm} \to τ^{\pm} ν_{τ}$ and $D_{s}^{\pm} \to μ^{\pm} ν_{μ}$ , $τ^{\pm} ν_{τ}$
Physical Review D, 2007
Evidence of the Purely Leptonic Decay $B^{-} \to τ^{-} {\bar{ν}}_{τ}$
Physical Review Letters, 2006
Search for the decayB+→τ+ντ
Physical Review D, 2006
Relativistic treatment of the decay constants of light and heavy mesons
Physics Letters B, 2006
Charmed-Meson Decay Constants in Three-Flavor Lattice QCD
Physical Review Letters, 2005
Effect of H on Ds -> and Ds ->
Progress of Theoretical Physics, 2004
Heavy-light meson decay constant from QCD sum rules in the three-loop approximation
Physical Review D, 2002
c,b quark masses and f,f decay constants from pseudoscalar sum rules in full QCD to order α2
Physics Letters B, 2001
Leptonic and semileptonic decays of charm and bottom hadrons
Reviews of Modern Physics, 1995