Contribution of QCD Condensates to the OPE of Green Functions of Chiral Currents
August 02, 2019
Correlators of the odd-intrinsic parity sector of QCD form a significant part of all Green functions of chiral currents. To calculate contribution of resonances to the correlators of the odd sector at NLO, one can use the resonance Lagrangian, which, however, still contains many unknown coupling constants. One of the ways of obtaining them is to compare the resonance contribution with the behaviour of such correlator at high energies. The operator product expansion (OPE) is a useful framework for such an approach. The matching leads to important coupling constants constraints that are expressed in terms of QCD condensates.
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