Using data samples of 988. 4 fb^-1 and 427. 9 fb^-1 collected with the Belle and Belle II detectors, we present a study of the singly Cabibbo-suppressed decays Ξc^0 Λη, Λη', and Λπ⁰. We observe the decay Ξc⁰ Λη and find evidence for the decay Ξc⁰ Λη', with corresponding branching ratios determined to be B (Ξc⁰ Λη) /B (Ξc⁰ Ξ^- π^+) = (4. 16 0. 91 0. 23) \% and B (Ξc⁰ Λη') /B (Ξc⁰ Ξ^- π^+) = (2. 48 0. 82 0. 12) \%, respectively. We find no significant signal in the Ξc⁰ Λπ⁰ decay mode and set an upper limit at the 90% credibility level of B (Ξc⁰ Λπ⁰) /B (Ξc⁰ Ξ^- π^+) < 3. 5\%. Multiplying these ratios by the world-average branching fraction of the normalization channel, B (Ξc⁰ Ξ^- π^+) = (1. 43 0. 27) \%, we obtain the absolute branching fractions of B (Ξc⁰ Λη) = (5. 95 1. 30 0. 32 1. 13) 10^-4, B (Ξc⁰ Λη') = (3. 55 1. 17 0. 17 0. 68) 10^-4, and an upper limit at the 90% credibility level on the absolute branching fraction of B (Ξc⁰ Λπ⁰) < 5. 2 10^-4. The quoted first and second uncertainties are statistical and systematic, respectively, while the third uncertainties arise from the branching fraction of the normalization mode. These results are consistent with most theoretical predictions and further the understanding of the underlying decay mechanisms.
Abumusabh et al. (Thu,) studied this question.
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