Scalar Mesons as qbar^2 q^2? Insight from the Lattice

Abstract

I describe some insight obtained from a lattice calculation on the possibility that the light scalar mesons are \qbar^2 q^2 states rather than \qbar q. First I review some general features of \qbar^2 q^2 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.

13 pages, 4 images, uses aipproc.cls

References in corpus (2)

• Masses of singlet and non-singlet 0++ particles
• Lattice study of "f${}_0$(600) or $\sigma$"

Cited by in corpus (5)

• Tetraquark bound states in a Bethe-Salpeter approach
• Effects of staggered fermions and mixed actions on the scalar correlator
• Scalar meson in dynamical and partially quenched two-flavor QCD: lattice results and chiral loops
• The $\sigma$-meson: four-quark vs. two-quark components and decay width in a Bethe-Salpeter approach
• Production of a Q^2\bar{Q}^2 state in J/ψ\to γωϕ