First measurements of branching fractions for D_s^+ → K_S^0 K_S^0 π^+ π^0 and D_s^+ → K_S^0 K^+ π^0 π^0 are (4.08 ± 0.46 ± 0.45)×10^{-3} and (3.32 ± 0.64 ± 0.31)×10^{-3}.
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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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Measurement of branching fractions of $D^+_s\to K^0_SK^0_S \pi^+\pi^0$ and $D^+_s\to K^0_S K^+\pi^0\pi^0$
First measurements of branching fractions for D_s^+ → K_S^0 K_S^0 π^+ π^0 and D_s^+ → K_S^0 K^+ π^0 π^0 are (4.08 ± 0.46 ± 0.45)×10^{-3} and (3.32 ± 0.64 ± 0.31)×10^{-3}.
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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.