charge density.

نویسنده

  • Ettore Vicari
چکیده

We study the Euclidean two-point correlation function Gq(x) of the topological charge density in QCD. A general statement based on reflection positivity tells us that Gq(x) < 0 for x 6= 0. On the other hand the topological susceptibility χq = ∫ dxGq(x) is a positive quantity. This indicates that Gq(x) developes a positive contact term at x = 0, that contributes to the determination of the physical value of χq. We show explicitly these features of Gq(x) in a solvable nontrivial continuum model, the two-dimensional CPN−1 model in the large-N limit. A similar analysis is done on the lattice.

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تاریخ انتشار 1999