Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-08-28
Nucl.Phys. B593 (2001) 398-412
Physics
High Energy Physics
High Energy Physics - Theory
14 pages, Latex file
Scientific paper
10.1016/S0550-3213(00)00625-8
We analyse the recent controversy on a possible Chern-Simons like term generated through radiative corrections in QED with a CPT violating term : we prove that, if the theory is correctly defined through Ward identities and normalisation conditions, no Chern-Simons term appears, without any ambiguity. This is related to the fact that such a term is a kind of minor modification of the gauge fixing term, and then no renormalised. The past year literature on that subject is discussed, and we insist on the fact that any absence of an {\sl a priori} divergence should be explained by some symmetry or some non-renormalisation theorem.
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