Meson and tetra-quark mixing

Abstract

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.

7 pages, 6 figures

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• Non-ordinary light meson couplings and the $1/N_c$ expansion
• Fragmentation functions for axial-vector heavy tetraquarks: A TQ4Q1.1 update
• Mixing and $m_q$ dependence of axial vector mesons in the Coulomb gauge QCD model
• The lightest flavor--singlet qqq baryons as witnesses to color
• Dynamical transition between two mesons and a tetraquark
• Some aspects on four quarks recombination
• Unified Hamiltonian model for mesons and baryons