Two-loop electroweak corrections to the rho parameter beyond the leading approximation
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Two-loop electroweak corrections to the rho parameter beyond the leading approximation

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Two-loop electroweak corrections to the rho parameter beyond the leading approximation

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Papavassiliou, Joannis; Philippides, Kostas; Sasaki, Ken
This document is a artículoDate1996

Este documento está disponible también en : http://hdl.handle.net/10550/42989
We show that in the framework of the pinch technique the universal part of the ρ parameter can be meaningfully defined, beyond one loop. The universal part so obtained satisfies the crucial requirements of gauge-independence, finiteness, and process-independence, even when subleading contributions of the top quark are included. The mechanism which enforces the aforementioned properties is explained in detail, and several subtle field theoretical issues are discussed. Explicit calculations of the sub-leading two-loop corrections of order O(G2μm2tM2Z) are carried out in the context of an SU(2) model, with MW=MZ, and various intermediate and final results are reported.

    Papavassiliou, Joannis Philippides, Kostas Sasaki, Ken 1996 Two-loop electroweak corrections to the rho parameter beyond the leading approximation Physical Review D 53 7 3942 3961
http://dx.doi.org/10.1103/PhysRevD.53.3942

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