Renormalon contributions to δρ

Details Renormalon contributions to δρ Renormalon contributions to δρ

1995-05-30

arxiv.org/abs/hep-ph/9505426v1

Phys.Lett. B355 (1995) 295-300

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, plain latex

Scientific paper

10.1016/0370-2693(95)00741-3

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 $\delta\rho$.

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