Abstract
The four-body calculations for Λ4He and Λ4H with high accuracy have been performed in the framework of the variational method with Jacobian-coordinate Gaussian-basis functions. All the rearrangement channel of both NNNΛ and NNNΣ are explicitly taken into account for the first time using realistic NN and YN interactions. The important role of Λ−Σ conversion and the amount of the virtual Σ-component in Λ4He and Λ4H are discussed.
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