Diquarks: properties and their role in hadrons

Diquark correlations are important in baryons, which can be modeled as quark‐diquark bound states. In addition, diquarks could play a role in non‐standard hadrons such as tetraquarks and pentaquarks. Here, we obtain properties of these diquarks from the corresponding bound state equation, using a model for the effective quark‐quark interaction that has proved successful in the light meson sector. Subsequently, we use the same model to estimate the masses of the lightest diquark‐diquark and diquark‐antidiquark states.