  We discuss the possibility that threshold photoproduction of $\eta_{c,b}$ may
be sensitive to the pseudovector $1^{+-}$ glueball exchange. We use the
holographic construction to identify the pseudovector glueball with the
Kalb-Ramond field, minimally coupled to bulk Dirac fermions. We derive the
holographic C-odd form factor and its respective charge radius. Using the
pertinent Witten diagrams, we derive and analyze the differential
photoproduction cross section for $\eta_{c,b}$ in the threshold regime,
including the interference from the dual bulk photon exchange with manifest
vector dominance. The possibility of measuring this process at current and
future electron facilities is discussed.
