Measurements of the branching fractions of ${\Xi }_c^0\to \Lambda K_S^0$, ${\Xi }_c^0\to {\Sigma }^0{K}_S^0$, and ${\Xi }_c^0\to {\Sigma }^{+}{K}^{-}$ decays at Belle

Abstract

Using the entire data sample of $980{\mathrm{fb}}^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we present measurements of the branching fractions of the Cabibbo-favored decays ${\Xi }_c^0\to \Lambda K_S^0$, ${\Xi }_c^0\to {\Sigma }^0{K}_S^0$, and ${\Xi }_c^0\to {\Sigma }^{+}{K}^{-}$. Taking the decay $Ξ_c^0 \to Ξ^- \pip$ as the normalization mode, we measure the branching fraction ratio $\mathcal{B}({\Xi }_c^0\to \Lambda K_S^0)/\mathcal{B}({\Xi }_c^0\to {\Xi }^{-}{\pi }^{+})=0.229\pm 0.008\pm 0.012$ with improved precision, and measure the branching fraction ratios $\mathcal{B}({\Xi }_c^0\to {\Sigma }^0{K}_S^0)/\mathcal{B}({\Xi }_c^0\to {\Xi }^{-}{\pi }^{+})=0.038\pm 0.006\pm 0.004$ and $\mathcal{B}({\Xi }_c^0\to {\Sigma }^{+}{K}^{-})/\mathcal{B}({\Xi }_c^0\to {\Xi }^{-}{\pi }^{+})=0.123\pm 0.007\pm 0.010$ for the first time. Taking into account the branching fraction of the normalization mode, the absolute branching fractions are determined to be $\mathcal{B}({\Xi }_c^0\to \Lambda K_S^0)=(3.27\pm 0.11\pm 0.17\pm 0.73)\times 10^{-3}$, $\mathcal{B}({\Xi }_c^0\to {\Sigma }^0{K}_S^0)=(0.54\pm 0.09\pm 0.06\pm 0.12)\times 10^{-3}$, and $\mathcal{B}({\Xi }_c^0\to {\Sigma }^{+}{K}^{-})=(1.76\pm 0.10\pm 0.14\pm 0.39)\times 10^{-3}$. The first and second uncertainties above are statistical and systematic, respectively, while the third ones arise from the uncertainty of the branching fraction of ${\Xi }_c^0\to {\Xi }^{-}{\pi }^{+}$.

arXiv comment10 pages, 4 figures, 3 tables; accepted for publication as a Letter in Physical Review D

References in corpus (11)

• High-Energy-Physics Event Generation with PYTHIA 6.1
• Asymmetries of anti-triplet charmed baryon decays
• Two-body hadronic weak decays of antitriplet charmed baryons
• Measurements of Branching Fractions of $\tau$ Lepton Decays with one or more $K_S^0$
• A diagrammatic analysis of two-body charmed baryon decays with flavor symmetry
• First measurements of absolute branching fractions of ${\Xi }_c^0$ at Belle
• Studies of charmed strange baryons in the $\Lambda D$ final state at Belle
• Search for $CP$ Violation and Measurement of the Branching Fraction in the Decay $D^0\to K_S^0{K}_S^0$
• Measurements of the branching fractions of the semileptonic decays ${\Xi }_c^0\to {\Xi }^{-}{\ell }^{+}{\nu }_{\ell }$ and the asymmetry parameter of ${\Xi }_c^0\to {\Xi }^{-}{\pi }^{+}$
• Measurement of masses and branching ratios of ${\Xi }_c^{+}$ and ${\Xi }_c^0$ baryons
• Measurements of branching fractions and asymmetry parameters of ${\Xi }_c^0\to \Lambda {\bar{K}}^{\ast 0}$, ${\Xi }_c^0\to {\Sigma }^0{\bar{K}}^{\ast 0}$, and ${\Xi }_c^0\to {\Sigma }^{+}{K}^{\ast -}$ decays at Belle

Cited by in corpus (3)

• Charmed Baryon Physics Circa 2021
• First measurements of the branching fractions for the decay modes ${\Xi }_c^0\to \Lambda \eta$ and ${\Xi }_c^0\to \Lambda {\eta }^{\prime }$ and search for the decay ${\Xi }_c^0\to \Lambda {\pi }^0$ using Belle and Belle II data
• Puzzles in charmed baryon semileptonic decays with $SU(3{)}_F$ flavor symmetry and lattice inputs