  In the context of Stueckelberg's covariant symplectic mechanics, Horwitz and
Aharonovich have proposed a simple mechanism by which a particle traveling
below light speed almost everywhere may exhibit a transit time that suggests
superluminal motion. This mechanism, which requires precise measurement of the
particle velocity, involves a subtle perturbation affecting the particle's
recorded time coordinate caused by virtual pair processes. The Stueckelberg
framework is particularly well suited to such problems, because it permits pair
creation/annihilation at the classical level. In this paper, we study a
trajectory of the type proposed by Horwitz and Aharonovich, and derive the
Maxwell 4-vector potential associated with the motion. We show that the
resulting fields carry a signature associated with the apparent superluminal
motion, providing an independent test for the mechanism that does not require
direct observation of the trajectory, except at the detector.
