arXiv:hep-ph/0011373·v2·High Energy Physics — Phenomenology
Three-Loop Leading Top Mass Contributions to the rho Parameter
J.J. van der Bij🇩🇪 · K.G. Chetyrkin🇩🇪 · M. Faisst🇩🇪 · G. Jikia🇩🇪 · T. Seidensticker🇩🇪
Abstract
We present analytical results for the leading contributions of the top quark to the electroweak rho parameter at order GF^3 Mt^6 and GF^2 Mt^4 alpha_s. The Higgs boson and the gauge bosons are taken to be massless in this limit. The correction of order GF^3 Mt^6 is found to be sizeable in comparison to the the leading two-loop GF^2 Mt^4 correction, however it is much smaller than the subleading GF^2 Mt^2 MZ^2 correction.
Comments: 10 pages, 2 figures, Latex. v2: two minor corrections in the references. Accepted for publication in Phys. lett. B. The complete paper is also available via the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/