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+====== TTP06-17 Four-Loop QCD Corrections to the Rho Parameter ======
+   <hidden TTP06-17  Four-Loop QCD Corrections to the Rho Parameter > The four-loop QCD corrections to the electroweak $\rho$-parameter
+ arising from top and bottom quark loops are computed. Specifically we
+ evaluate the missing ``non-singlet'' piece. Using algebraic methods
+ the amplitude is reduced to a set of around 50 new master integrals
+ which are calculated with various analytical and numerical
+ methods. Inclusion of the newly completed term halves the final value
+ of the four-loop correction for the minimally renormalized top-quark
+ mass. The predictions for the shift of the weak mixing angle and the
+ W-boson mass is thus stabilized.
+ </hidden>
+|**K.G.~Chetyrkin, M.~Faisst, J.H.~Kuehn, P. Maierhoefer, C. Sturm**  |
+|**  Phys. Rev. Lett.  97 102003 2006  **  |
+| {{preprints:2006:ttp06-17.pdf|PDF}} {{preprints:2006:ttp06-17.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0605201|arXiv]]   |
+| |