2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178763We study the possibility that the light scalar mesons are (qbar qbar q q) states rather than (qbar q). We perform a lattice QCD calculation of pseudoscalar meson scattering amplitudes, ignoring quark loops and quark annihilation, and find indications that for sufficiently heavy quarks there is a stable four-quark bound state with J^{PC}=0^{++} and non-exotic flavor quantum numbers.16 pages, revtex, with eps figuresHigh Energy Physics - LatticeHigh Energy Physics - ExperimentHigh Energy Physics - PhenomenologyNuclear Theorytext