We estimate the twist-four, spin-two contribution to the asymmetry parameter Aed. For this we use the operator-product expansion of the product of electromagnetic and weak currents and the MIT bag model. We include the effects of the breaking of the Callan-Gross relation and also those of the parity-violating structure function F₃. The uncertainty in the determination of sin²{{{θ}}}W$ due to the twist-four effects is smaller than 0.5%.
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Castorina et al. (1985) studied this question.
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