Observations of the singly Cabibbo-suppressed decays $$ {\Xi}_c^{+}\to p{K}_S^0 $$, $$ {\Xi}_c^{+}\to \Lambda {\pi}^{+} $$, and $$ {\Xi}_c^{+}\to {\Sigma}^0{\pi}^{+} $$ at Belle and Belle II

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Abstract 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 $$ {\Xi}_c^{+}\to p{K}_S^0 $$ Ξ c + → p K S 0 , $$ {\Xi}_c^{+}\to \Lambda {\pi}^{+} $$ Ξ c + → Λ π + , and $$ {\Xi}_c^{+}\to {\Sigma}^0{\pi}^{+} $$ Ξ c + → Σ 0 π + are observed for the first time. The ratios of branching fractions of $$ {\Xi}_c^{+}\to p{K}_S^0 $$ Ξ c + → p K S 0 , $$ {\Xi}_c^{+}\to \Lambda {\pi}^{+} $$ Ξ c + → Λ π + , and $$ {\Xi}_c^{+}\to {\Sigma}^0{\pi}^{+} $$ Ξ c + → Σ 0 π + relative to that of $$ {\Xi}_c^{+}\to {\Xi}^{-}{\pi}^{+}{\pi}^{+} $$ Ξ c + → Ξ − π + π + are measured to be $$ {\displaystyle \begin{array}{c}\frac{\mathcal{B}\left({\Xi}_c^{+}\to p{K}_S^0\right)}{\mathcal{B}\left({\Xi}_c^{+}\to {\Xi}^{-}{\pi}^{+}{\pi}^{+}\right)}=\left(2.47\pm 0.16\pm 0.07\right)\%,\\ {}\frac{\mathcal{B}\left({\Xi}_c^{+}\to \Lambda {\pi}^{+}\right)}{\mathcal{B}\left({\Xi}_c^{+}\to {\Xi}^{-}{\pi}^{+}{\pi}^{+}\right)}=\left(1.56\pm 0.14\pm 0.09\right)\%,\\ {}\frac{\mathcal{B}\left({\Xi}_c^{+}\to {\Sigma}^0{\pi}^{+}\right)}{\mathcal{B}\left({\Xi}_c^{+}\to {\Xi}^{-}{\pi}^{+}{\pi}^{+}\right)}=\left(4.13\pm 0.26\pm 0.22\right)\%.\end{array}} $$ B Ξ c + → p K S 0 B Ξ c + → Ξ − π + π + = 2.47 ± 0.16 ± 0.07 % , B

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