Production Spectra of the ΣNN Quasibound States in 3He(K −, π ∓) Reactions

Abstract

We theoretically demonstrate the inclusive and semiexclusive spectra in the 3He (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. It is shown that a signal of a $${^3_\Sigma{\rm He}}$$ quasibound state is clearly observed near the Σ threshold in the π − spectrum, whereas a peak of a $${^3_\Sigma{\rm n}}$$ quasibound state is relatively reduced in the π + spectrum. The mechanism of Σ production for these spectra is discussed.