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Four-Loop QCD Corrections to the Rho Parameter | | K.G. Chetyrkin
; M. Faisst
; J.H. Kühn
; P. Maierhoefer
; C. Sturm
; | | Date: |
18 May 2006 | | Abstract: | The four-loop QCD corrections to the electroweak $
ho$-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. | | Source: | arXiv, hep-ph/0605201 | | Services: | Forum | Review | PDF | Favorites | |
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