The tetramixing of pseudoscalar mesons π-η-η′-ηc and
vector mesons ω-ρ-ϕ-J/ψ are studied in the light-cone
constituent quark model, and such mixing of four mesons provides a natural
source for the intrinsic charm ccˉ components of light mesons. By mixing
with the light mesons, the charmonium states J/ψ and ηc could decay
into light mesons more naturally, without introducing gluons or a virtual
photon as intermediate states. Thus, the introduction of light quark components
into J/ψ is helpful to reproduce the new experimental data of J/ψ
decays. The mixing matrices and the Q2 behaviors of the transition form
factors are also calculated and compared with experimental data.Comment: 20 pages, 10 figures. Version for publication in PR