Dibaryon concept for nuclear force and its experimental evidence

Abstract

Numerous theoretical and experimental arguments are presented in favor of the generation of intermediate σ-dressed dibaryon in NN interaction at middle and short distances. We argue that this intermediate dibaryon can be responsible for the strong middle-range attraction and the short-distance repulsion in the NN interaction, and also for the short-range correlations in nuclei. The suggested mechanism for the σ dressing of the dibaryon is identical to that which explains the Roper-resonance structure, its dominant decay modes, and its extraordinary low mass. A similar transformation mechanism from the glue to the scalar field was discovered in J/ψ decays. The new experimental data on 2π production in the scalar-isoscalar channel in pn and pd collisions and in, particular, the very recent data on γγ correlations in pC and dC scattering in the GeV region seems to corroborate the existence of the σ-dressed dibaryon in two- and three-nucleon interactions.