Renormalon contributions to δρ

Abstract

Leading QCD vacuum polarization contributions to the electroweak parameter $\delta \rho$ are evaluated numerically using several different prescriptions for the gluon self-energy. Simple theoretical estimates of the asymptotic behavior are given. The results show a significant contribution from the leading infrared renormalons when $\delta \rho$ is expressed in terms of the top-quark pole mass and its absence when the $\msbar$ running mass is employed. The calculations are applied to estimate higher order QCD contributions to $\delta \rho$.

9 pages, plain latex

References in corpus (2)

• Naive nonabelianization and resummation of fermion bubble chains
• On the connection between the pinch technique and the background field method

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