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論文

Results of $$bar{K}NN$$ search via the $$(K^-, n)$$ reaction at J-PARC

山我 拓巳*; 橋本 直; 谷田 聖; 他66名*

JPS Conference Proceedings (Internet), 26, p.023008_1 - 023008_6, 2019/11

There is a long-standing argument of the existence of kaonic nucleus, which is a bound state of anti-kaon and nucleus. Theoretically, its existence is strongly supported, however its binding energy and width have not been established yet. It is strongly desired to have an experiment to investigate the simplest kaonic nucleus, so-called $$K^-pp$$ bound state. We performed an experiment to search for $$K^-pp$$ via the in-flight $$(K^-, n)$$ reaction at J-PARC. By studying $$Lambda p$$ invariant mass spectrum in the $$Lambda pn$$ final state and its dependence on momentum transfer of $$K^{-}N to bar{K}N$$, we observed a resonant state located below $$M_{K^{-}pp}$$. The mass and width of this resonant state are $$2324 pm 3(textit{stat}.)_{-3}^{+6}(textit{syst}.)$$ MeV/$$c^2$$, and $$115 pm 7(textit{stat}.)_{-20}^{+10}(textit{syst}.)$$ MeV, respectively, which can be naturally interpreted as a theoretically predicted $$K^-pp$$ bound state.

論文

Study of the elementary $$(K^-,n)$$ reactions to search for the $$bar{K}NN$$ bound state via the $$^3$$He$$(K^-,n)$$ reaction at J-PARC

山我 拓巳*; 谷田 聖; 他74名*

AIP Conference Proceedings 1375, p.040007_1 - 040007_6, 2016/05

 被引用回数:0 パーセンタイル:100

We have searched for the simplest kaonic nuclear state, $$bar{K}NN$$, using the in-flight $$^3$$He$$(K^-,n)$$ reaction at the J-PARC hadron experimental facility. In the semi-inclusive neutron missing-mass spectrum at $$theta_{n}^{rm lab}=0^{circ}$$, an excess of yield was observed just below the $$K^-pp$$ mass-threshold, which cannot be explained by any elementary reactions [PTEP 2015, 061D01]. To understand the missing-mass spectrum of $$^3$$He$$(K^-,n)X$$, we investigated the elementary $$(K^-,n)$$ reactions using hydrogen and deuterium targets. The $$p(K^-,n)X$$ missing-mass spectrum was well described by the charge-exchange reaction. However, in the $$d(K^-,n)X$$ spectrum, we observed an excess of yield just below the $$K^-p$$ mass-threshold, which was similar to that in the $$^3$$He$$(K^-,n)X$$ spectrum.

論文

Spectroscopic study of hyperon resonances below $$bar{K}N$$ threshold via the $$(K^-,n)$$ reaction on deuteron

山我 拓巳*; 谷田 聖; J-PARC E31 Collaboration*; 他70名*

JPS Conference Proceedings (Internet), 8, p.021016_1 - 021016_5, 2015/09

We are planning to carry out an experimental study of hyperon resonance via the $$d(K^-,n)$$ reaction using kaon beam which has momentum of 1 GeV/$$c$$ at the J-PARC hadron experimental facility. In the presented reaction, $$Lambda(1405)$$ can be produced dynamically from meson-baryon resonant state. The performance of the counters was tested at the previous beam time of the J-PARC. The counters worked as expected. The preparation of experimental setup had been done.

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