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Abstract
Renormalization group arguments are applied to a Reggeon field theory which couples fermion and pomeron trajectories. The bare (input) fermion propagator has both positive and negative parity poles on the physical angular momentum plane for all values of u. However, after interacting with the Pomeron, the negative parity pole of the renormalized (output) fermion propagator migrates onto an unphysical angular momentum sheet for positive u, and so only the positive parity state appears as a physical particle. This provides a dynamical explanation for the disappearance of the negative parity partner, and is a property which is expected to be possessed by most reasonable Reggeon field theories.
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