The topological susceptibility and pion decay constant from lattice QCD
Abstract
We study the topological susceptibility, chi, in two flavour lattice QCD. We find clear evidence for the expected suppression of chi at small quark mass. The estimate of the pion decay constant, fpi = 105 +/-5 +18/-10 MeV, is consistent with the experimental value of approximately 93 MeV. We compare chi to the large-Nc prediction and find consistency over a large range of quark masses.
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