The Peak Structure in the In-Flight ${}^3\text{He}(K^{-},\Lambda p)n$ Reaction Around the $\bar{K}NN$ Threshold

Abstract

We theoretically investigate the origin of the peak structure around the $K^{-}pp$ threshold observed in the in-flight ${}^3\text{He}(K^{-},\Lambda p)n$ reaction in the recent E15 experiment at J-PARC. For this purpose, we consider 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 one is that the $\bar{K}NN$ bound state is indeed generated and decays into $\Lambda p$. As a result, the experimental signal is qualitatively well reproduced in the $\bar{K}NN$ bound scenario, definitely discarding the uncorrelated $\Lambda (1405)p$ one.

5 pages, 9 EPS figures, talk given at the 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016), Kyoto, Japan, 25-30 July. 2016

References in corpus (9)

• Faddeev calculation of a $K^{-}pp$ quasi-bound state
• Strange dibaryon resonance in the anti-KNN--piYN system
• Indication of a deeply bound compact K-pp state formed in the pp -> p Lambda K+ reaction at 2.85 GeV
• $K^{-}pp$ system with chiral SU(3) effective interaction
• Variational calculations for K-few-nucleon systems
• Observation of the "$K^{-}pp$"-like structure in the $d({\pi }^{+},K^{+})$ reaction at 1.69 GeV/$c$
• The $\bar{K}NN$ system with chiral dynamics
• Lambda(1405)-induced non-mesonic decay in kaonic nuclei
• Search for the deeply bound $K^{-}pp$ state from the semi-inclusive forward-neutron spectrum in the in-flight $K^{-}$ reaction on helium-3