Comment on the Dispersion Relations used to Calculate Δρ

TR Number
Date
1995-06-01
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Soc
Abstract

We use the operator product expansion (OPE) 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 non-relativistic calculation of corrections to the t¯t threshold are inconsistent with this result.

Description
Keywords
Astronomy & Astrophysics, Physics, Particles & Fields, Physics, VACUUM-POLARIZATION FUNCTIONS, QCD, THRESHOLD, BOSONS, WIDTH
Citation