Evidence at 3.6 sigma is reported for the semileptonic decays Lambda_c+ to Sigma^pm pi^mp e+ nu_e with branching fraction (7.7 +2.5 -2.3 stat +/- 1.3 syst) x 10^-4, consistent with quark-model predictions.
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First observation of the Dalitz transition h_c → e⁺e⁻ η_c at 5.4σ significance with measured branching fraction ratio of 0.59% relative to the radiative decay h_c → γ η_c.
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Evidence for the semileptonic decays $\Lambda_c^{+} \to \Sigma^{\pm} \pi^{\mp} e^+ \nu_e$
Evidence at 3.6 sigma is reported for the semileptonic decays Lambda_c+ to Sigma^pm pi^mp e+ nu_e with branching fraction (7.7 +2.5 -2.3 stat +/- 1.3 syst) x 10^-4, consistent with quark-model predictions.
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Observation of the Electromagnetic Dalitz Transition $h_c \rightarrow e^+e^-\eta_c$
First observation of the Dalitz transition h_c → e⁺e⁻ η_c at 5.4σ significance with measured branching fraction ratio of 0.59% relative to the radiative decay h_c → γ η_c.