Identification of the 125 GeV Resonance as a Pseudoscalar Quarkonium Meson

Abstract

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 $|{\zeta }^{0^{\prime }}>$ produces the states identified with the pseudoscalar heavy quarkonium mesons ${\zeta }^0$ and ${\zeta }^{0^{\prime }}$. For a mixing angle $\varphi \sim 36{}^{\circ }$ 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.

Comments: 8 pages, Latex file, no figures. Revised version. References added. Further revision made