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Two-loop heavy top effects on the MZ-MW interdependence

G. Degrassi, P. Gambino, A. Vicini

Abstract

The O(alpha^2 mt^2/mw^2) correction to the relation between G_μand the vector boson masses is computed in the MSbar scheme, and the results are used to investigate the magnitude of the effect on the theoretical prediction of mw and sin^2θ_\msbar(mz) from alpha, G_μ, and mz.

Two-loop heavy top effects on the MZ-MW interdependence

Abstract

The O(alpha^2 mt^2/mw^2) correction to the relation between G_μand the vector boson masses is computed in the MSbar scheme, and the results are used to investigate the magnitude of the effect on the theoretical prediction of mw and sin^2θ_\msbar(mz) from alpha, G_μ, and mz.

Paper Structure

This paper contains 1 section, 6 equations, 1 figure, 1 table.

Table of Contents

  1. Acknowledgments

Figures (1)

  • Figure 1: $\Delta\hat{\rho}^{(2)}$ in units $N_c ( {\hat{\alpha}} /(4 \pi \hbox{$\hat{s}^2$}))^2 (m_t^2/(4 m_{ Z}^2 \hbox{$\hat{c}^2$}))^2$. The solid lines represent the expressions in Eq.(10) and a simple interpolating function. The dotted line represents the leading $O(G_\mu^2 m_t^4)$ term, first two lines of Eq.(10b).