The Peak Structure in the In-Flight3He(K−, Λp)nReaction Around the \(\bar{K}NN\) Threshold

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

doi:10.7566/jpscp.13.020002

Proceedings of the 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016) 2017

DOI: 10.7566/jpscp.13.020002

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The Peak Structure in the In-Flight³He(K⁻, Λp)nReaction Around the \(\bar{K}NN\) Threshold

Takayasu Sekihara

E. Oset²,

A. Ramos³

Abstract: We theoretically investigate the origin of the peak structure around the K − pp threshold observed in the in-flight 3 He(K − , Λp)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 Λ(1405) is generated but it does not correlate with p, and the uncorrelated Λ(1405)p system subsequently decays into Λp. The other one is that theKNN bound state is indeed generated and decays into Λp. As a result, the experimental signal is qualitative… Show more

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2019

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Further Theoretical Analysis on the \(K^{ - 3}\text{He} \to \Lambda pn\) Reaction for the \(\bar{K}NN\) Bound-State Search in the J-PARC E15 Experiment

Sekihara

Oset

Ramos

2019

Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)

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Based on the scenario that aKNN bound state is generated and it eventually decays into Λp, we calculate the cross section of the K −3 He → Λpn reaction, which was recently measured in the J-PARC E15 experiment. We find that the behavior of the calculated differential cross section d 2 σ/dM Λp dq Λp , where M Λp and q Λp are the Λp invariant mass and momentum transfer in the (K − , n) reaction in the laboratory frame, respectively, is consistent with the experiment. Furthermore, we can reproduce almost quantitatively the experimental data of the Λp invariant mass spectrum in the momentum transfer window 350 MeV/c < q Λp < 650 MeV/c. These facts strongly suggest that theKNN bound state was indeed generated in the J-PARC E15 experiment.

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Further Theoretical Analysis on the \(K^{ - 3}\text{He} \to \Lambda pn\) Reaction for the \(\bar{K}NN\) Bound-State Search in the J-PARC E15 Experiment

Sekihara

Oset

Ramos

2019

Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)

View full text Add to dashboard Cite

show abstract

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The Peak Structure in the In-Flight³He(K⁻, Λp)nReaction Around the \(\bar{K}NN\) Threshold

Cited by 1 publication

References 26 publications

Further Theoretical Analysis on the \(K^{ - 3}\text{He} \to \Lambda pn\) Reaction for the \(\bar{K}NN\) Bound-State Search in the J-PARC E15 Experiment

Further Theoretical Analysis on the \(K^{ - 3}\text{He} \to \Lambda pn\) Reaction for the \(\bar{K}NN\) Bound-State Search in the J-PARC E15 Experiment

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