Dibaryon resonances and short-range $NN$ interaction

TL;DR

This paper proposes a dibaryon-based model for the nuclear force, combining six-quark states with meson exchange to accurately describe nucleon-nucleon scattering across various energies and partial waves.

Contribution

It introduces a microscopic six-quark model incorporating dibaryon states to explain the $NN$ interaction, aligning with experimental dibaryon resonances and predicting new states.

Findings

Accurately describes $NN$ phase shifts and inelasticities up to 800 MeV.

Parameters align with known dibaryon resonances.

Predicts new dibaryon states.

Abstract

The dibaryon concept for the nuclear force is presented, assuming that the main attraction between the nucleons at medium distances is determined by the $s$-channel exchange of an intermediate six-quark (dibaryon) state. To construct the respective $NN$ interaction model, a microscopic six-quark description of the $NN$ system is used, in which symmetry aspects play a special role. It is shown that the $NN$ interaction in all important partial waves can be described properly by a superposition of the long-range $t$-channel one-pion exchange and the $s$-channel exchange by an intermediate dibaryon. The developed model gives a good description of both elastic phase shifts and inelasticities of $NN$ scattering in all $S$, $P$, $D$ and $F$ partial waves at energies from zero to 600 - 800 MeV and even higher.The parameters of the intermediate six-quark states corresponding to the best fit of $NN$ scattering data are found to be consistent with the parameters of the known dibaryon resonances in those $NN$ partial configurations where their existence has been experimentally confirmed. Predictions for new dibaryon states are given as well.