出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We determine the topological susceptibility ct in the trivial topological sector generated by lattice
simulations of two-flavor QCD with overlap Dirac fermion, on a 163 ×32 lattice with lattice
spacing 0.12 fm, at six sea quark masses mq ranging from ms/6 to ms (where ms is the physical
strange quark mass). The ct is extracted from the plateau (at large time separation) of the timecorrelation
function of the flavor-singlet pseudoscalar meson (h0), which arises from the finite
size effect due to fixed topology. In the small mq regime, our result of ct is proportional to mq
as expected from chiral effective theory. Using the formula ct = mqS/Nf by Leutwyler-Smilga,
we obtain the chiral condensate in Nf = 2 QCD as SMS(2 GeV) = [254(5)(10)MeV]3, in good
agreement with our previous result obtained in the e -regime.
