Meson and tetra-quark mixing

P. WANG; S. R. COTANCH; I. J. GENERAL

EUROPEAN PHYSICAL JOURNAL C - PARTICLES AND FIELDS

SPRINGER

Lugar: Berlin; Año: 2008 p. 409 - 415

1434-6044

The mixing between q q meson and q q q q tetra-quark states is examined within an effective QCD Coulomb gauge Hamiltonian model. Mixing matrix elements of the Hamiltonian are computed and then diagonalized yielding an improved prediction for the low-lying J P C = 0±+ , 1−− isoscalar spectra. Mixing effects were found significant for the scalar hadrons but not for the 1−− states, which is consistent with the ideal mixing of vector mesons. A perturbative assessment of the exact QCD kernel is also reported.