TY - JOUR
T1 - Problems with the Breitenlohner-Maison γ5-scheme in flavour changing neutral currents
AU - Barroso, A.
AU - Doncheski, M. A.
AU - Grotch, H.
AU - Körner, J. G.
AU - Schilcher, K.
N1 - Funding Information:
’ Supported by NSF Grant PHY-88 19727-01. * Present address, Phenomenology Institute, Physics, University of Wisconsin-Madison, Avenue, Madison, WI 53706, USA. 3 Partially supported by the INIDA program
PY - 1991/5/23
Y1 - 1991/5/23
N2 - 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.
AB - 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.
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U2 - 10.1016/0370-2693(91)91336-T
DO - 10.1016/0370-2693(91)91336-T
M3 - Article
AN - SCOPUS:0000760286
SN - 0370-2693
VL - 261
SP - 123
EP - 126
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-2
ER -