Meson and tetra-quark mixing

Research paper by Ping Wang, Stephen R. Cotanch, Ignacio J. General

Indexed on: 30 Jan '08Published on: 30 Jan '08Published in: High Energy Physics - Phenomenology


The mixing between q-qbar meson and qqbar-qqbar 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^{PC} = 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.