Abstract
We present a calculation of second class (SC) effects in τ decays induced by QCD corrections to the weak vertex [Formula: see text]. We find that the induced SC form factors behave like (md − mu)/q2 (q the momentum transfer, and mq the q-quark mass), which give branching ratios of O(10−6) and O(10−8) for the scalar and pseudotensor SC decays, respectively.
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