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Measurement of the $D_s^+ \to \ell^+\nu_\ell$ branching fractions and the decay constant $f_{D_s^+}$
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arxiv 1608.06732 v2 pith:OLTRTHEF submitted 2016-08-24 hep-ex
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abstract
Using 482~pb$^{-1}$ of $e^+e^-$ collision data collected at a center-of-mass energy of $\sqrt{s} = 4.009$ GeV with the BESIII detector, we measure the branching fractions of the decays $D_s^+\to\mu^+\nu_\mu$ and $D_s^+\to\tau^+\nu_\tau$. By constraining the ratio of decay rates of $D_s^+$ to $\tau^+\nu_\tau$ and to $\mu^+\nu_\mu$ to the Standard Model prediction, the branching fractions are determined to be $\mathcal{B}(D_s^+ \to \mu^+\nu_\mu) = (0.495 \pm 0.067 \pm 0.026)\%$ and $\mathcal{B}(D_s^+ \to \tau^+\nu_\tau) = (4.83 \pm 0.65 \pm 0.26)\%$. Using these branching fractions, we obtain a value for the decay constant $f_{D_s^+}$ of $(241.0 \pm 16.3 \pm 6.5)~\text{MeV}$, where the first error is statistical and the second systematic.
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Improved measurement of the branching fraction of $D_s^+\to\mu^+\nu_\mu$
hep-ex 2023-07 unverdicted novelty 4.0 of 10
Measures Br(D_s^+ → μ^+ ν_μ) = (0.5294 ± 0.0108_stat ± 0.0085_syst)% and extracts f_{D_s^+} |V_cs| = 241.8 ± 4.7 MeV.
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