Abstract
We use the operator product expansion to show that nonperturbative QCD corrections to \ensuremath{\Delta}\ensuremath{\rho} can be calculated using unsubtracted dispersion relations for either the transverse or the longitudinal vacuum polarization functions. Recent calculations of the nonperturbative contribution to \ensuremath{\Delta}\ensuremath{\rho} based on a nonrelativistic calculation of corrections to the tt\ifmmode\bar\else\textasciimacron\fi{} threshold are inconsistent with this result.
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