Title of Paper:
Evidence for a narrow D 03 state in K − p→ηΛ near threshold
Summary:
Recently, we reported a theoretical study on the K − p→ηΛ reaction near threshold by using an effective Lagrangian approach. It was found that the description of angular distribution data measured by the Crystal Ball Collaboration needs a D 03 resonance with mass M=1668.5±0.5 MeV and total decay width Γ=1.5±0.5 MeV, which is not the conventional Λ (1690) or other Λ state listed in the Particle Data Group book. In the present work, we study the Λ polarization in the K − p→ηΛ reaction within the same framework. The results show that the existence of this narrow D 03 state is also compatible with current Λ polarization data and that the more accurate Λ polarization data at P K − =735 MeV can offer further evidence for the existence of this resonance. Furthermore, the role of the Λ(1690) resonance in this reaction is also discussed.
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