Problems with the Breitenlohner-Maison γ5-scheme in flavour changing neutral currents

A. Barroso, M. A. Doncheski, H. Grotch, J. G. Körner, K. Schilcher

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We calculate the flavour changing neutral current (FCNC) decay Z → Q q ̄ at one-loop order using two different γ5-prescriptions, namely the Breitenlohner-Maison-'t Hooft-Veltman (BM) γ5-scheme and a naively anticommuting γ5. The results obtained in the two schemes differ from one another. The BM γ5-scheme calculation violates the conventional Ward identity relating the Z → Q q ̄ and the unphysical scalar φz → Q q ̄ proper vertices which the naive γ5-calculation satisfies. Hence, we conclude that it is incorrect to naively apply the BM γ5-scheme if the standard model is renormalized on-shell.

Original languageEnglish (US)
Pages (from-to)123-126
Number of pages4
JournalPhysics Letters B
Issue number1-2
StatePublished - May 23 1991

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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