  The top-down holographic Witten-Sakai-Sugimoto model for low-energy QCD,
augmented by finite quark masses, has recently been found to be able to
reproduce the decay pattern of the scalar glueball candidate f0(1710) on a
quantitative level. In this Letter we show that this model predicts a narrow
pseudoscalar glueball heavier than the scalar glueball and with a very
restricted decay pattern involving eta or eta' mesons. Production should be
either in pairs or in association with eta(') mesons. We discuss the prospect
of discovery in high-energy hadron collider experiments through central
exclusive production by comparing with eta' pair production.
