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This paper presents the derivation of Schwinger's gauge invariant result of$Im \cal{L}_{eff}$ upto one loop approximation, for particle production in anuniform electric field through the method of complex trajectory WKBapproximation (CWKB). The CWKB proposed by one of the author's \cite{bis:ijtp}looks upon particle production as due to the motion of a particle in complexspace-time plane, thereby requiring tunneling paths both in space and time.Recently \cite{srini:iucaa,srini1:iucaa} there have been some efforts tocalculate the reflection and transmission co-efficients for particle productionin uniform electric field that differ from our expressions for the same. Inthis paper we clarify the confusion in this regard and establish thecorrectness of CWKB.Comment: 14 Pages, LaTeX, no figur

SCHWINGER'S RESULT ON PARTICLE PRODUCTION FROM COMPLEX PATHS WKB APPROXIMATION