We consider one-loop corrections to partial widths of the Z induced by supersymmetric Yukawa interactions that violate R-parity. The precise experimental values of the leptonic Z partial widths bound these Yukawa couplings, with the most interesting constraints being those on couplings involving τ, since previous constraints on them were very mild.
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Gautam Bhattacharyya A (1995) studied this question.
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