Measurement of masses and branching ratios of Ξc+ and Ξc0 baryons

We report a measurement of the Ξc+ and Ξc0 baryon masses, and the branching ratios for various Ξc decays, using 140fb−1 of data collected by the Belle experiment at the KEKB e+e− collider. The mass splitting mΞc0−mΞc+ is found to be 2.9±0.5MeV/c2; this measurement is three times as precise as the current world average. We measure the branching ratios Γ(Ξc+→ΛK−π+π+)/Γ(Ξc+→Ξ−π+π+)=0.32±0.03±0.02 and Γ(Ξc0→pK−K−π+)/Γ(Ξc0→Ξ−π+)=0.33±0.03±0.03, with improved precision, and measure Γ(Ξc+→pKS0KS0)/Γ(Ξc+→Ξ−π+π+)=0.087±0.016±0.014, Γ(Ξc0→ΛK−π+)/Γ(Ξc0→Ξ−π+)=1.07±0.12±0.07 and Γ(Ξc0→ΛKS0)/Γ(Ξc0→Ξ−π+)=0.21±0.02±0.02 for the first time.