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HK: Hadronen und Kerne

HK 33: Structure of Baryons, Mesons V, Theory

HK 33.6: Talk

Tuesday, March 17, 1998, 15:45–16:00, J

Estimates of higher–dimensional vacuum condensates from the instanton vacuum — •C. Weiss² and M.V. Polyakov^1,2 — ¹Petersburg Nuclear Physics Institute, St. Petersburg — ²Institut für Theoretische Physik II, Ruhr–Universität Bochum

QCD sum rule calculations generally require vacuum expectation values of operators of high dimensions. We calculate the values of non-factorizable dimension–7 condensates in the instanton vacuum. We comment on a method, recently proposed by Oganesian, to estimate the dimension–7 condensates by factorization of dimension–10 condensates in various inequivalent ways. The instanton estimates can be used to analyze the stability of QCD sum rules with increasing dimensions of operators.

[1] M.V. Polyakov and C. Weiss, Bochum University preprint RUB-TPII-7/97, hep-ph/9710534.