Scalar Mesons as qbar2 q2? Insight from the Lattice
M. Alford, R. L. Jaffe
Abstract
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.
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