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Non-renormalization of the full <VVA> correlator at two-loop order
Non-renormalization of the full <VVA> correlator at two-loop order
2006-02-14
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arxiv.org/abs/hep-th/0602137v2
Physics
High Energy Physics
High Energy Physics - Theory
6 pages, 1 figure
Scientific paper
10.1016/j.nuclphysbps.2006.03.01
By explicit calculation of the two-loop QCD corrections we show that for singlet axial and vector currents the full off-shell correlation function in the limit of massless fermions is proportional to the one-loop result, when calculated in the MS-bar scheme. By the same finite renormalization which is needed to make the one-loop anomaly exact to all orders, we arrive at the conclusion that two-loop corrections are absent altogether, for the complete correlator not only its anomalous part. In accordance with the one-loop nature of the correlator, one possible amplitude, which seems to be missing by accident at the one-loop level, also does not show up at the two-loop level.
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