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What makes the peak structure of the $$Lambda p$$ invariant-mass spectrum in the $$K^{-3} rm He rightarrow Lambda$$$$pn$$ reaction?

Sekihara, Takayasu; Oset, E.*; Ramos, A.*

In this contribution we theoretically investigate what is the origin of the peak structure observed in the E15 experiment at J-PARC. Since the peak exists near the $$K^{-}pp$$ threshold, we expect two scenarios to produce the peak. One is that the $$Lambda (1405)$$ is generated but it does not correlate with $$p$$, and the uncorrelated $$Lambda (1405)$$-$$p$$ system subsequently decays into $$Lambda p$$. The other is that the $$bar{K} N N$$ quasi-bound state is indeed generated and decays into $$Lambda p$$. We calculate the $$Lambda p$$ invariant mass spectrum of the reaction with these two scenarios and compare it with the experimental one to interpret the experimental peak structure.

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Category:Physics, Multidisciplinary

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