Previous results for the pair production probability in a strong electric field with a finite longitudinal separation are generalized to the case of a finite-length flux tube with transverse confinement. The threshold length of the flux tube, below which pair production cannot occur, increases as a result of transverse confinement.

• Received 30 September 1994

DOI:https://doi.org/10.1103/PhysRevD.51.3940