  The 125 GeV resonance discovered at the LHC could be a heavy quarkonium
pseudoscalar meson. The diagonalization of the mass matrix of the isoscalar
quarkonium states $|\zeta>$ and $|\zeta^{0'}>$ produces the states identified
with the pseudoscalar heavy quarkonium mesons $\zeta^0$ and $\zeta^{0'}$. For a
mixing angle $\phi\sim 36\,^{\circ}$ the mass of the bound state pseudoscalar
resonance $\zeta^0$ is $m_{\zeta^0}\sim 125$ GeV. The decay rates of the
quarkonium $\zeta^0$ meson are estimated and compared to the standard model
Higgs boson predictions. The importance of determining the spin-parity of the
125 GeV resonance is discussed. Criteria for experimentally discriminating
between the pseudoscalar, $J^{PC}=0^{-+}$, $\zeta^0$ quarkonium meson and the
scalar $J^{PC}=0^{++}$ Higgs boson are investigated.
