Four-Loop Singlet Contribution to the $ρ$ Parameter

Details Four-Loop Singlet Contribution to the $ρ$ Parameter Four-Loop Singlet Contribution to the $ρ$ Parameter

2005-04-07

arxiv.org/abs/hep-ph/0504055v2

Phys.Lett. B622 (2005) 124-130

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, minor changes to match published version, references added

Scientific paper

10.1016/j.physletb.2005.06.085

We compute the four-loop 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.

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