Phys. Rev. D 51, 6457–6462 (1995)Remarks on the dispersion relations used to calculate ΔρReceived 18 March 1994; published in the issue dated 1 June 1995 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. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.51.6457
DOI:
10.1103/PhysRevD.51.6457
PACS:
11.55.Fv, 12.15.Lk
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