# Differences

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+ | ====== TTP06-17 Four-Loop QCD Corrections to the Rho Parameter ====== | ||

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+ | <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]] | | ||

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