Using 7.33 fb −1 of e + e − collision data collected by the BESIII detector at center-of-mass energies between 4.128 and 4.226 GeV, we observe for the first time the decay D ± s → ωπ ± η with a statistical significance of 7.6σ. The measured branching fraction of this decay is (0.54 ± 0.12 ± 0.04)%, where the first uncertainty is statistical and the second is systematic.
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