Four-Loop QCD Corrections to the Rho Parameter

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dc.creatorChetyrkin, K. G.
dc.creatorFaisst, M.
dc.creatorKühn, J. H.
dc.creatorMaierhoefer, P.
dc.creatorSturm, C.
dc.date2006-05-18
dc.date2006-09-28
dc.date.accessioned2026-07-07T11:58:45Z
dc.date.available2026-07-07T11:58:45Z
dc.descriptionThe four-loop QCD corrections to the electroweak $ρ$-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.
dc.description3 pages, 1 figure. Few references are added.The final text published in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/hep-ph/0605201
dc.identifierhttp://arxiv.org/abs/hep-ph/0605201
dc.identifierPhys.Rev.Lett.97:102003,2006
dc.identifierdoi:10.1103/PhysRevLett.97.102003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206332
dc.subjectHigh Energy Physics - Phenomenology
dc.titleFour-Loop QCD Corrections to the Rho Parameter
dc.typetext

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