Comment on the Dispersion Relations used to Calculate $Δρ$

Details Comment on the Dispersion Relations used to Calculate $Δρ$ Comment on the Dispersion Relations used to Calculate $Δρ$

1994-03-15

arxiv.org/abs/hep-ph/9403294v1

Phys.Rev.D51:6457-6462,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pgs of Latex. FERMILAB-PUB-94/037-T, EFI 94-07

Scientific paper

10.1103/PhysRevD.51.6457

We use the operator product expansion (OPE) to show that non-perturbative QCD corrections to $\Delta\rho$ can be calculated using unsubtracted dispersion relations for either the transverse or the longitudinal vacuum polarization functions. Recent calculations of the non-perturbative contribution to $\Delta\rho$ based on a non-relativistic calculation of corrections to the $\ttbar$ threshold are inconsistent with this result.

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