Abstract:Using a 3.19 fb −1 data sample collected at the ffiffi ffi s p ¼ 4.178 GeV with the BESIII detector, we search for the rare decay D þ s → ppe þ ν e. No significant signal is observed, and an upper limit of BðD þ s → ppe þ ν e Þ < 2.0 × 10 −4 is set at the 90% confidence level. This measurement is useful input in understanding the baryonic transition of D þ s mesons.
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