Observation of \(D^+_s\to η^\prime μ^+ν_μ\), Precision Test of Lepton Flavor Universality with \(D^+_s\to η^{(\prime)} \ell^+ν_\ell\), and First Measurements of \(D^+_s\to η^{(\prime)}μ^+ν_μ\) Decay Dynamics

By Besiii Collaboration and others
By analyzing 7.33 fb\(^{-1}\) of \(e^+e^-\) annihilation data collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector, we report the observation of the semileptonic decay \(D^+_s\to \eta^\prime \mu^+\nu_\mu\), with a statistical significance larger than 10\(\sigma\), and the measurements of the \(D_s^+ \to \eta\mu^+\nu_\mu\) and $D_s^+ \to... Show more
February 29, 2024
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