$η-η^\prime$ Mixing in the Flavor Basis and Large N

$η-η^\prime$ Photoproduction and the Axial Isoscalar Neutral Current Coupling

$η-η^{\prime}$ Mixing Angle from Vector Meson Radiative Decays

$η/s$ and Phase Transitions

$η\to 3 π$ at Two Loops In Chiral Perturbation Theory

$η\to π^0 γγ$ decay in the three-flavor Nambu-Jona-Lasinio model

$η\to π^0 γγ$ decay within a chiral unitary approach revisited

$η\to π^0 γγ$ decay within unitarized chiral perturbation theory

$η\to π^0 γγ$ to ${\cal{O}}(p)^6$ in Chiral Perturbation Theory

$η\to π^{0} γγ$ and $γγ\to π^{0} π^{0}$ in $O(p^{6})$ chiral perturbation theory

$η^{(\prime)}$ productions in semileptonic B decays

$η_c$ - glueball Mixing and Resonance X(1835)

$η_c$ mixing effects on charmonium and $B$ meson decays

$η_c$ production and dimuon enhancement in heavy ion collisions

$ηγZ$ anomaly from the $η-->γμ+μ-$ decay

$θ$ Bag and Quark Confinement

$Θ$ vacua states in heavy ion collisions in presence of dissipation and noise

$θ$ Vacuum in a Random Matrix Model

$θ$ Vacuum: A Matrix Model

$θ$-dependence of QCD at Finite Isospin Density