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We use the QCD instanton vacuum model to discuss the emergence of the lightscalar and vector mesons on the light front. We take into account both theinstanton and anti-instanton single and molecular interactions on the lightquarks, in the form of non-local effective interactions. Although the molecularinduced interactions are suppressed by a power of the packing fraction, theyare still sufficient to bind the vector mesons, while keeping most of thescalar spectrum relatively unchanged. We explicitly derive the light frontdistribution amplitudes (DAs) and partonic functions (PDFs) for the scalar andvector mesons, and compare them after pertinent QCD evolution, to the availableempirical and lattice measured counterparts. The Dirac electric form factorsfor both the pion and rho meson are derived, and shown to compare well withcurrent data.

Hadronic structure on the light-front VIII. Light scalar and vector mesons