Pseudoscalar glueball mass from eta-eta '-G mixing

We deduce the mass of the pseudoscalar glueball G from an eta-eta'-G mixing formalism based on the anomalous Ward identity for transition matrix elements. With the inputs from the recent KLOE experiment, we find a solution for the pseudoscalar glueball mass around (1.4 +/- 0.1) GeV, which is fairly insensitive to a range of inputs with or without Okubo-Zweig-Iizuka-rule violating effects. This affirms that eta(1405), having a large production rate in the radiative J / psi decay and not seen in gamma gamma reactions, is indeed a leading candidate for the pseudoscalar glueball. Other relevant quantities including the anomaly and pseudoscalar density matrix elements are obtained. The decay widths for G -> gamma gamma, l(+)l(-) are also predicted.