A nonlinear Rξ-gauge for the electroweak theory
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.
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| Main Authors: | , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Sociedad Mexicana de Física
2004
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| Online Access: | http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0035-001X2004000400005 |
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| Summary: | 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. |
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