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RESEARCH PRODUCT

On the structure observed in the in-flight 3He(K,p)n reaction at J-PARC

Takayasu SekiharaEulogio OsetAngels Ramos

subject

Nuclear physicsPhysics010308 nuclear & particles physics0103 physical sciencesGeneral Physics and AstronomyJ-PARC010306 general physics01 natural sciencesNuclear theory

description

A theoretical investigation is done to clarify the origin of the peak structure observed near the Kpp threshold in the in-flight 3He(K,p)n reaction of the J-PARC E15 experiment, which could be a signal of the lightest kaonic nuclei, i.e., the KNN(I1/2) state. For the investigation, we evaluate the p invariant mass spectrum assuming two possible scenarios to interpret the experimental peak. One assumes that the (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. This uncorrelated (1405)p system subsequently decays into the final p . The other scenario implies that, after the emission of the energetic neutron, a KNN bound state is formed, decaying eventually into a p pair. Our results show that the experimental signal observed in the in-flight 3He(K,p)n reaction at J-PARC is qualitatively well reproduced by the assumption that a KNN bound state is generated in the reaction, definitely discarding the interpretation in terms of an uncorrelated (1405)p state.

10.1093/ptep/ptw166http://repo.scoap3.org/api