The KN interaction from 800 to 1200 MeV/c (III) a study of Λ(1520)

Abstract The resonant parameters of Λ(1520) have been determined from an analysis of the reaction sequence K − p → Σ (1760) → Λ (1520) π 0 with subsequent decay of Λ(1520) into K − p, Σ ± π ∓ and Λπ + π − . The best values for the Λ(1520) mass and width are: E R = 1517.2 ± 0.6 MeV. Γ = 14.7 ± 1.8 MeV. Its decay branching ratios are Γ(Σπ)/Γ( K N ) = 0.82 ± 0.08 and Γ(Λππ)/Γ( K N ) = 0.22 ± 0.03 and its branching fractions Γ( K N )/Λ = 0.49 ± 0.02, Γ(Σπ)/Γ = 0.40 ± 0.02. Γ(Λππ)/Γ = 0.11 ± 0.01 .