发布时间：2025-04-30

论文名称：Evidence for a narrow D 03 state in K − p→ηΛ near threshold

发表刊物：Phys.Rev. C

摘要：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.

合写作者：B. C. Liu and J. J. Xie

卷号：86

页面范围：055202

是否译文：否

发表时间：2012-10-06