Correlator of Topological Charge Densities in Instanton Model in QCD

Details Correlator of Topological Charge Densities in Instanton Model in QCD Correlator of Topological Charge Densities in Instanton Model in QCD

1999-06-08

arxiv.org/abs/hep-ph/9906285v2

Phys.Atom.Nucl. 63 (2000) 1448-1454; Yad.Fiz. 63 (2000) 1527-1533

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 2 figures

Scientific paper

10.1134/1.1307466

The QCD sum rule for the correlator of topological charge densities and related to it longitudinal part of the correlator of singlet axial currents is considered in the framework of instanton model. The coupling constant of eta'-meson with the singlet axial current is determined. Its value appears to be in a good coincidence with the value determined recently from the connection of the part of proton spin, carried by u,d,s quarks, with the derivative of QCD topological susceptibility. From the same sum rule eta-eta' mixing angle is found in the framework of two mixing angles model. Its value is close to that found in the chiral effective theory. The correlator of topological charge densities at large momenta is calculated.

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