U_e(1)--covariant R_ξ--gauge for the two Higgs doublet model

Details U_e(1)--covariant R_ξ--gauge for the two Higgs doublet model U_e(1)--covariant R_ξ--gauge for the two Higgs doublet model

2009-06-29

arxiv.org/abs/0906.5139v1

Pramana 73:1023-1039,2009

Physics

High Energy Physics

High Energy Physics - Theory

Scientific paper

10.1007/s12043-009-0164-y

An $U_e(1)$--covariant $R_\xi$ gauge for the two Higgs doublet model based in the BRST symmetry is introduced. This gauge allows one to remove an important number of nonphysical vertices appearing in conventional linear gauges, which greatly simplifies the loop calculations, since the the resultant theory satisfies QED--like Ward identities. The presence of four ghost interactions in this type of gauges and its connection with the BRST symmetry is stressed. The Feynman rules for those new vertices that arise in this gauge, as well as for those couplings already present in the linear $R_\xi$ gauge but that are modified by this gauge--fixing procedure, are presented.

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