It is shown that the bosonic contributions to the S, T, and U parameters, defined in terms of conventional self-energies, are gauge dependent in the standard model (SM). Moreover, T and U are divergent unless a constraint is imposed among the gauge parameters. Implications of this result for renormalization schemes of the SM are discussed. A gauge-invariant formulation of S, T, and U is proposed in the pinch-technique framework. The modified S, T, and U parameters provide a gauge-invariant parametrization of leading electroweak radiative corrections in the SM and some of its extensions.

DEGRASSI G, KNIEHL BA, & SIRLIN A (1993). GAUGE-INVARIANT FORMULATION OF THE S, T, AND U PARAMETERS. PHYSICAL REVIEW D, 48(9), R3963-R3966.

GAUGE-INVARIANT FORMULATION OF THE S, T, AND U PARAMETERS

DEGRASSI, GIUSEPPE;
1993

Abstract

It is shown that the bosonic contributions to the S, T, and U parameters, defined in terms of conventional self-energies, are gauge dependent in the standard model (SM). Moreover, T and U are divergent unless a constraint is imposed among the gauge parameters. Implications of this result for renormalization schemes of the SM are discussed. A gauge-invariant formulation of S, T, and U is proposed in the pinch-technique framework. The modified S, T, and U parameters provide a gauge-invariant parametrization of leading electroweak radiative corrections in the SM and some of its extensions.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11590/131285
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