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Extended soft-core baryon–baryon interactions
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DOI：10.1016/j.ppnp.2026.104243.png)
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Abstract
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The Nijmegen extended-soft-core (ESC) models treat in a unified way, using broken flavor SU(3) symmetry, the low- and intermediate-energy interactions of nucleon–nucleon (NN), hyperon–nucleon (YN), and hyperon–hyperon/nucleon (YY/ ΞN) systems with strangeness S=0,-1,-2,-3,-4 respectively. The potentials consist of local and non-local potentials due to (i) One-boson exchanges (OBE), which are the members of nonets of pseudoscalar-, vector-, scalar-, and axial-vector mesons, (ii) Two pseudoscalar exchange (TPS), (iii) Meson-Pair-exchange (MPE) and (iv) Diffractive exchanges. Both the OBE- and Pair-vertices are regulated by Gaussian form factors producing potentials with a soft behavior near the origin. Broken SU(3) symmetry serves to connect the NN, YN and YY channels. In particular, the meson–baryon coupling constants are calculated via SU(3) using the coupling constants of the NN-analysis as input. The assignment of the cut-off masses for the BBM-vertices is dependent on the SU(3)-classification of the exchanged mesons for OBE, and a similar scheme for MPE.
Keywords:
Soft-core baryon–baryon interactions
SU(3) symmetry
Baryon–quark mixed-matter
Neutron-stars
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