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 — preprints:2006:ttp06-17 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== 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. + ​ + |**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]] ​  | + | |