Leading QCD vacuum polarization contributions to the electroweak parameter Δϱ 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 Δϱ is expressed in terms of the top-quark pole mass and its absence when the running mass is employed. The calculations are applied to estimate higher-order QCD contributions to Δϱ.

Renormalon contributions to Δϱ

GAMBINO, Paolo;
1995-01-01

Abstract

Leading QCD vacuum polarization contributions to the electroweak parameter Δϱ 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 Δϱ is expressed in terms of the top-quark pole mass and its absence when the running mass is employed. The calculations are applied to estimate higher-order QCD contributions to Δϱ.
1995
355
295
300
http://www.sciencedirect.com/science/article/pii/0370269395007413
Paolo Gambino; Alberto Sirlin
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/104259
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