Abstract
We use the operator product expansion to show that nonperturbative QCD corrections to Δρ can be calculated using unsubtracted dispersion relations for either the transverse or the longitudinal vacuum polarization functions. Recent calculations of the nonperturbative contribution to Δρ based on a nonrelativistic calculation of corrections to the tt¯ threshold are inconsistent with this result.
- Received 18 March 1994
DOI:https://doi.org/10.1103/PhysRevD.51.6457
©1995 American Physical Society
