Improved Measurement of Absolute Branching Fraction of Ds to tau nu

CLEO Collaboration: P.U.E. Onyisi; et al

Improved Measurement of Absolute Branching Fraction of Ds to tau nu

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arxiv 0901.1147 v3 pith:XC7TJP4P submitted 2009-01-09 hep-ex

CLEO Collaboration: P.U.E. Onyisi , et al This is my paper · ORCID

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keywords decayabsoluteanti-nubranchingchannelcleo-ccollectedcollisions

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We have studied the leptonic decay D^+_s to tau^+ nu_tau, via the decay channel tau^+ to e^+ nu_e anti-nu_tau, using a sample of tagged D_s^+ decays collected near the D^*_s D_s peak production energy in e^+ e^- collisions with the CLEO-c detector. We obtain B(D^+_s to tau^+ nu_tau) = (5.30 +- 0.47 +- 0.22) % and determine the decay constant f_Ds = (252.5 +- 11.1 +- 5.2) MeV, where the first uncertainties are statistical and the second are 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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