The Correlator of Topological Charge Densities at low Q² in QCD
Ioffe, B. L.
Original · EN
The correlator of topological charge densities χ(Q²) in QCD is calculated in the domain of low Q². Basing on the Ward identities the low energy theorems are proved. The value of the first derivative χ′(0) found recently by QCD sum rules 1 is used. The contributions of pseudoscalar quasi-Goldstone bosons as intermediate states in the correlator are calculated with the account of η-π mixing.
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