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The last decade has seen a marked shift in how the internal structure ofhadrons is understood. Modern experimental facilities, new theoreticaltechniques for the continuum bound-state problem and progress withlattice-regularised QCD have provided strong indications that soft quark+quark(diquark) correlations play a crucial role in hadron physics. For example,theory indicates that the appearance of such correlations is a necessaryconsequence of dynamical chiral symmetry breaking, viz. a corollary of emergenthadronic mass that is responsible for almost all visible mass in the universe;experiment has uncovered signals for such correlations in theflavour-separation of the proton's electromagnetic form factors; andphenomenology suggests that diquark correlations might be critical to theformation of exotic tetra- and penta-quark hadrons. A broad spectrum of suchinformation is evaluated herein, with a view to consolidating the facts andtherefrom moving toward a coherent, unified picture of hadron structure and therole that diquark correlations might play.

Diquark Correlations in Hadron Physics: Origin, Impact and Evidence