Comparative study of hyperon-nucleon interactions in a quark model and in chiral effective field theory by low-momentum equivalent interactions and G matrices

摘要

Hyperon-nucleons interactions constructed by two frameworks, the Kyoto-Niigata SU6 quark model and the chiral effective field theory, are compared by investigating equivalent interactions in a low-momentum space and, in addition, by calculating hyperon single-particle potentials in the lowest-order Brueckner theory in symmetric nuclear matter. Two descriptions are shown to give similar matrix elements in most channels after renormalizing high momentum components. Although the range of the ΛN interaction is different in two potentials, the Λ single-particle potential in nuclear matter is very similar. The Σ-nucleus and Ξ-nucleus potentials are also found to be similar. These predictions are to be confronted with forthcoming experimental data.