4He(K−,π−) Spectra and the Σ4He Bound State
We examine phenomenologically the 4He(K −,π−) spectra in flight and at rest within the distorted-wave impulse approximation by using a coupled (3N−Λ)+(3N−Σ) model with a spreading potential. The resultant spectra can explain consistently all the available data. We show that there exists a pole of the Σ 4 He unstable bound state on the second Riemann sheet of the complex energy plane.
KeywordsPole Position Resultant Spectrum Spreading Potential Riemann Sheet Complex Energy Plane
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