Resumen

MENDEZ, J.G.  y  TOSCANO, J.J.. A nonlinear R_ξ-gauge for the electroweak theory. Rev. mex. fis. [online]. 2004, vol.50, n.4, pp.346-352. ISSN 0035-001X.

A Gauge-fixing procedure for the electroweak theory, based in the BRST symmetry and covariance under the electromagnetic group, is proposed. It is found that in order to have a renormalizable theory, four-ghost interactions must be included in the BRST invariant action, since in this class of gauges these couplings are induced at the one-loop level. This type of gauges allows us to remove several unphysical vertices appearing in conventional linear gauges, which greatly simplifies the loop calculations, since the resultant theory satisfies QED-like Ward identities. Explicit expressions for the Lagrangian of the bosonic sector, including the corresponding ghost term, are presented.

Palabras llave : Electroweak theory; nonlinear gauges.

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