Topological charge correlators, spectral bounds, and contact terms

Authors :: Thacker, H.
Dong, S.J.
Draper, T.
Horváth, I.
Lee, F.X.
Liu, K.F.
Zhang, J.B.
Source :: Nuclear Physics B Proceedings Supplement. May2003, Vol. 119 Issue 1-3, p685. 3p.
Publication Year :: 2003
Abstract: The structure of topological charge fluctuations in the QCD vacuum is strongly restricted by the spectral negativity of the Euclidean correlator for <F>x ≠ 0</F> and the presence of a positive contact term. Some examples are considered which illustrate the physical origin of these properties. [Copyright &y& Elsevier]