The Λ(1405)N → YN transition in the nuclear medium for non-mesonic absorption of a in nuclei

✍ Scribed by T. Sekihara; D. Jido; Y. Kanada-En'yo

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 197 KB
• Volume: 835
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2010.01.226

✦ Synopsis

The non-mesonic transition Λ(1405)N → YN is investigated as one of the essential processes for the non-mesonic absorption of a K in nuclei. Using a one-meson exchange model in the calculation of the transition, we find that the non-mesonic transition ratio Γ ΛN /Γ ΣN depends strongly on the ratio of the Λ(1405) (Λ * ) couplings to KN and πΣ. Especially, a larger Λ * -KN coupling leads to enhancement of the transition to ΛN. Using the chiral unitary model for the description of the Λ * , we obtain Γ ΛN /Γ Σ 0 N ≈ 1.2 which is almost independent of the nucleon density, and find the total non-mesonic decay width of the Λ * in uniform nuclear matter to be 22 MeV at the normal density.