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Towards an effective-action approach to fermion-loop corrections

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arxiv hep-ph/0303105 v2 pith:FASA7HUK submitted 2003-03-13 hep-ph

W. Beenakker , A.P. Chapovsky , A. Kanaki , C.G. Papadopoulos , R. Pittau This is my paper · ORCID
classification hep-ph
keywords approachactioneffectiveproblemssolutionszero-modeanalysisbehaviour
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We present a study of the effective action approach to incorporate higher-order effects in e^+e^- -> n fermions. In its minimal version, the effective action approach is found to exhibit problems with unitarity and high-energy behaviour. We identify the origin of these problems by investigating the zero-mode solutions of the Ward Identities. A numerical analysis of the importance of the zero-mode solutions is presented for four-fermion production processes.

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