Singlet VA \tilde V correlator within the instanton vacuum model

Details Singlet VA \tilde V correlator within the instanton vacuum model Singlet VA \tilde V correlator within the instanton vacuum model

2005-05-23

arxiv.org/abs/hep-ph/0505196v1

JETP Lett. 82 (2005) 1-6; Pisma Zh.Eksp.Teor.Fiz. 82 (2005) 3-7

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 4 figures

Scientific paper

10.1134/1.2045328

The correlator of singlet axial-vector and vector currents in the external electromagnetic field is studied within the instanton liquid model of QCD vacuum. In the chiral limit we calculate the longitudinal w_L^0 and transversal w_T^0 with respect to axial-vector index invariant amplitudes at arbitrary momentum transfer q. It is demonstrated how the anomalous longitudinal part of the correlator is renormalized at low momenta due to the presence of the U_A(1) anomaly.

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