Observations of the singly Cabibbo-suppressed decays Ξ^+_c → pK^0_S , Ξ^+_c → Λπ^+, and Ξ^+_c → Σ^0π^+ at Belle and Belle II
Using data samples of 983.0 fb⁻¹ and 427.9 fb⁻¹ accumulated with the Belle and Belle II detectors operating at the KEKB and SuperKEKB asymmetric-energy e⁺e⁻ colliders, singly Cabibbo-suppressed decays Ξc⁺ → pK_S⁰, Ξc⁺ → Λπ⁺, and Ξc⁺ → Σ⁰π⁺ are observed for the first time. The ratios of branching fractions relative to Ξc⁺ → Ξ⁻π⁺π⁺ are measured to be
%B(Ξc⁺→pK_S⁰) / B(Ξc⁺→Ξ⁻π⁺π⁺) = (2.47 ± 0.16 ± 0.07)
%B(Ξc⁺→Λπ⁺) / B(Ξc⁺→Ξ⁻π⁺π⁺) = (1.56 ± 0.14 ± 0.09)
%B(Ξc⁺→Σ⁰π⁺) / B(Ξc⁺→Ξ⁻π⁺π⁺) = (4.13 ± 0.26 ± 0.22)
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Using data samples of 983.0 fb⁻¹ and 427.9 fb⁻¹ accumulated with the Belle and Belle II detectors operating at the KEKB and SuperKEKB asymmetric-energy e⁺e⁻ colliders,…