open access

https://hdl.handle.net/2115/56862

ΣNN quasibound states in He3 (K−, π∓) reactions at 600 MeV/c

英語

2014-05-07

American Physical Society

Physical Review C

89(5)

054603

We theoretically demonstrate the inclusive and semiexclusive spectra in the He3(K−, π∓) reactions at 600 MeV/c (4∘) within a distorted-wave impulse approximation, using a coupled (2N−Λ)+(2N−Σ) model with a spreading potential. We present the possible existence of the ΣNN quasibound state with Jπ= 1/2+, T≃ 1 near the Σ threshold, predicted by a 2N−Y folding-model potential derived from YN g-matrices. The result shows that a signal of the 3ΣHe quasibound state is clearly confirmed near the Σ threshold in the π− spectrum, whereas a peak of the 3Σn quasibound state is rather reduced in the π+ spectrum owing to the interference effects caused by the 3S1-1S0 admixture in the NN pair. The mechanism of Σ production for these spectra and charge symmetry breaking effects are also discussed.

学術雑誌論文

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©2014 American Physical Society

0556-2813

1089-490X

AA00773613