Six-quark resonance structures in nucleon-nucleon scattering

The effects of short-range QCD models on two-hadron reactions are quantitatively predictable using R-matrix theory. Inelastic resonances are predicted in the two-nucleon S-state channels. The positions and magnitudes of these resonances are model sensitive but their widths, energy splitting, and inelastic modes are characteristic of the six-quark states (dibaryons). With a coupled-channel model for the two-baryon long-range wave function, the MIT bag model is found to be inconsistent with known phase shifts, but the cloudy bag model is consistent and predicts resonances near 2.7 GeV/$c^2$ mass. The observables have been calculated for pp and np scattering with reasonable assumptions about the background phases, and several are shown to have excitation function structures that are detectable.