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Four-loop singlet contribution to the electroweak ρ parameter
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DOI：10.1016/j.physletb.2005.06.085.png)
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Abstract
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We compute the four-loop QCD contribution to the electroweak rho parameter induced by the singlet diagrams of the Z-boson self-energy. The numerical impact on the weak mixing angle and the W-boson mass is small. (c) 2005 Elsevier B.V. All rights reserved.
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