On a possible manifestation of f1 trajectory in J/ψ photoproduction

We analyze a possible manifestation of f1-trajectory in elastic J/ψ photoproduction at high energy and large momentum transfer. In spite of the small contribution of f1-trajectory in total cross sections, it becomes significant in various spin observables. In particular, we show that the crucial test for f1-exchange can be made by measuring the single beam- and double parity- and beam–target asymmetries at large momentum transfers, where a strong deviation from the exchange of conventional Pomerons is expected. This effect is caused by the interference of natural (Pomeron) and unnatural (f1) parity exchange parts of amplitude in the region where their contributions become comparable to each other and might be interesting to observe in forthcoming experiments, if feasible.