Scalar Mesons as qbar² q²? Insight from the Lattice

الأصل · EN

I describe some insight obtained from a lattice calculation on the possibility that the light scalar mesons are ² q² states rather than q. First I review some general features of ² q² states in QCD inspired quark models. Then I describe a lattice QCD calculation of pseudoscalar meson scattering amplitudes, ignoring quark loops and quark annihilation, which finds indications that for sufficiently heavy quarks there is a stable four-quark bound state with JPC=0++ and non-exotic flavor quantum numbers.