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論文

Theoretical analysis on the $$K^{-3}$$He $$rightarrow Lambda pn$$ reaction for the $$bar{K} N N$$ bound-state search in the J-PARC E15 experiment

関原 隆泰; Oset, E.*; Ramos, A.*

Proceedings of Science (Internet), 310, 5 Pages, 2018/03

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 $$K^{-} p p$$ 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.

論文

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

関原 隆泰; Oset, E.*; Ramos, A.*

Acta Physica Polonica B, 48(10), p.1869 - 1874, 2017/10

 被引用回数:1 パーセンタイル:82.43(Physics, Multidisciplinary)

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.

論文

Theoretical study of the $$Xi(1620)$$ and $$Xi(1690)$$ resonances in $$Xi_c to pi+MB$$ decays

宮原 建太*; 兵藤 哲雄*; 岡 眞; Nieves, J.*; Oset, E.*

Physical Review C, 95(3), p.035212_1 - 035212_12, 2017/03

 被引用回数:17 パーセンタイル:10.71(Physics, Nuclear)

$$Xi_c$$$$pi^+$$とメソンーバリオン状態へ弱崩壊する過程をストレンジネス$$-2$$のバリオンのスペクトルの観点で解析した。

論文

The Peak structure in the in-flight $$^{3}$$He$$(K^{-}, Lambda p) n$$ reaction around the $$bar{K} N N$$ Threshold

関原 隆泰; Oset, E.*; Ramos, A.*

JPS Conference Proceedings (Internet), 13, p.020002_1 - 020002_5, 2017/02

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 $$K^{-} p p$$ 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.

論文

On the structure observed in the in-flight $$^{3}$$He($$K^{-}, Lambda p)n$$ reaction at J-PARC

関原 隆泰; Oset, E.*; Ramos, A.*

Progress of Theoretical and Experimental Physics (Internet), 2016(12), p.123D03_1 - 123D03_27, 2016/12

AA2016-0237.pdf:1.53MB

 被引用回数:30 パーセンタイル:10.66(Physics, Multidisciplinary)

In this contribution we theoretically investigate what is the origin of the peak structure observed in the E15 experiment of the in-flight $$^{3}$$He($$K^{-}, Lambda p)n$$ reaction at J-PARC, which could be a signal of the lightest kaonic nuclei, that is, the $$bar{K} N N (I=1/2)$$ state. For the investigation, we evaluate the $$Lambda p$$ invariant mass spectrum assuming two possible scenarios to interpret the experimental peak. One assumes that the $$Lambda(1405)$$ resonance is generated after the emission of an energetic neutron from the absorption of the initial $$K^-$$, not forming a bound state with the remaining proton. The other scenario implies that, after the emission of the energetic neutron, a $$bar{K} N N$$ bound state is formed. Our results show that the experimental signal observed in the in-flight $$^{3}$$He($$K^{-}, Lambda p)n$$ reaction at J-PARC is qualitatively well reproduced by the assumption that a $$bar{K} N N$$ bound state is generated in the reaction, definitely discarding the interpretation in terms of an uncorrelated $$Lambda (1405) p$$ state.

論文

Two-, three-, many-body systems involving mesons. Multimeson condensates

Oset, E.*; 他10名*; 岡 眞

Acta Physica Polonica B, 47(2), p.357 - 365, 2016/02

 被引用回数:3 パーセンタイル:63.6(Physics, Multidisciplinary)

メソン複数個を含むエキゾチックハドロンに関する研究成果をレビューした。未発見の状態については、今後の実験による探索を示唆した。

口頭

On the structure observed in the in-flight $$^{3}$$He$$(K^{-}, Lambda p)n$$ reaction at J-PARC

関原 隆泰; Oset, E.*; Ramos, A.*

no journal, , 

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 $$K^{-} p p$$ 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.

口頭

On the structure observed in the in-flight $$^{3}$$He($$K^{-}, Lambda p)n$$ reaction at J-PARC

関原 隆泰; Oset, E.*; Ramos, A.*

no journal, , 

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 $$K^{-} p p$$ 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.

口頭

On the structure observed in the in-flight $$^{3}$$He($$K^{-}, Lambda p)n$$ reaction at J-PARC

関原 隆泰; Oset, E.*; Ramos, A.*

no journal, , 

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 $$K^{-} p p$$ 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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