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Non-mesonic transition of Lambda(1405) N to YN is investigated as one of theessential processes for the non-mesonic absorption of Kbar in nuclei. Usingone-meson exchange model in the calculation of the transition, we find that thenon-mesonic transition ratio Gamma_{Lambda N} / Gamma_{Sigma N} dependsstrongly on the ratio of the Lambda(1405) (Lambda^*) couplings to Kbar N and piSigma. Especially a larger Lambda^*-Kbar N coupling leads to enhancement of thetransition to Lambda N. Using the chiral unitary model for the description ofthe Lambda^*, we obtain Gamma_{Lambda N} / Gamma_{Sigma^{0} N} is approximately1.2 which is almost independent of the nucleon density, and find the totalnon-mesonic decay width of the Lambda^* in uniform nuclear matter to be 22 MeVat the normal density.

Lambda(1405) N to Y N transition in nuclear medium for non-mesonic absorption of Kbar in nucleus