The O(G_mu^2 mt^4) correction to the ρ parameter is computed using the current algebra formulation of radiative corrections. This approach is proved to be equivalent to the effective Lagrangian method proposed by Barbieri et al. The same framework is then applied to the calculation of the correction to the ratio of neutral-to-charged-current amplitudes in an SU(2) model. In this model the contribution is shown to be numerically comparable to the leading term for realistic values of the top mass.
Current algebra approach to heavy top effects in delta (rho).
GAMBINO, Paolo
1995-01-01
Abstract
The O(G_mu^2 mt^4) correction to the ρ parameter is computed using the current algebra formulation of radiative corrections. This approach is proved to be equivalent to the effective Lagrangian method proposed by Barbieri et al. The same framework is then applied to the calculation of the correction to the ratio of neutral-to-charged-current amplitudes in an SU(2) model. In this model the contribution is shown to be numerically comparable to the leading term for realistic values of the top mass.
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