Extended-soft-core baryon-baryon model. I. Nucleon-nucleon scattering with the ESC04 interaction

Abstract

The NN results are presented from the extended-soft-core (ESC) interactions. They consist of local and nonlocal potentials due to (i) one-boson-exchanges (OBE), which are the members of nonets of pseudoscalar, vector, scalar, and axial mesons, (ii) diffractive exchanges, (iii) two-pseudoscalar exchanges (PS-PS), and (iv) meson-pair exchanges (MPE). We describe a fit to the pp and np data for 0&leq;T<SUB>lab</SUB>&leq;350 MeV, having a typical chi<SUP>2</SUP>/N<SUB>data</SUB>=1.155. Here, we used �20 quasi-free physical parameters, which are coupling constants and cutoff masses. A remarkable feature of the couplings is that we were able to require them to follow rather closely the pattern predicted by the <SUP>3</SUP>P<SUB>0</SUB> quark-pair-creation (QPC) model. As a result the 11 OBE couplings are rather constrained, i.e., quasi free. Also, the deuteron binding energy and the several NN scattering lengths are fitted.