On a possible manifestation of f(1) trajectory in J/psi photoproduction

We analyze a possible manifestation of f(1)-trajectory in elastic J/psi pho toproduction at high energy and large momentum transfer. In spite of the sm all contribution of fl-trajectory in total cross sections, it becomes signi ficant in various spin observables. In particular, we show that the crucial test for f(1)-exchange can be made by measuring the single beam- and doubl e parity- and beam-target asymmetries at large momentum transfers, where a strong deviation from the exchange of conventional Pomerons is expected. Th is effect is caused by the interference of natural (Pomeron) and unnatural (fl) parity exchange parts of amplitude in the region where their contribut ions become comparable to each other and might be interesting to observe in forthcoming experiments, if feasible. (C) 2001 Elsevier Science B.V. All r ights reserved.