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The effect coming from imaginary parts of effective couplings in the $e^+e^-$ asymmetries is investigated. It is shown that for the present level ofexperimental accuracy, in some asymmetries the imaginary parts of the effectivecouplings cannot be neglected and moreover that the use of differentprescriptions on how to handle them in quoting just real effective couplingsfrom the data may produce sizable differences. A definition of the realeffective couplings specifying how to handle the imaginary parts is advocated.Comment: 19 pages, IFAE-UAB/94-0

About the relevance of the imaginary components of the effective couplings in the asymmetry measurements