The short-range low-energy interaction between hadrons is studied with the quantum-chromodynamic one-gluon-exchange potential in the context of the resonating-group method. A soft-core approximation is used to estimate low-energy $s$-wave scattering lengths and amplitudes in exotic reactions: $K^{+}p$, $K^{+}n$, ${\pi }^{+}\pi$, and $K^{+}{\pi }^{+}$. Good agreement is found with data.

• Received 1 June 1979

DOI:https://doi.org/10.1103/PhysRevD.21.1251