出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We determine the topological susceptibility ct in the topologically-trivial sector generated by
lattice simulations of Nf = 2+1 QCD with overlap Dirac fermion, on a 163 ×48 lattice with
lattice spacing 0.11 fm, for five 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 2-point and 4-point time-correlation functions 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 agrees with the chiral effective theory. Using the formula ct = S(m−1
u +m−1
d +m−1
s )−1 by
Leutwyler-Smilga, we obtain the chiral condensate SMS(2 GeV) = [253(4)(6)MeV]3.
