Estimate of the chiral condensate in quenched lattice QCD
Abstract
We determine the value of the quark condensate from quenched QCD simulations on the lattice in two ways: (i) by using the GMOR formula; (ii) by comparing the OPE prediction for the Goldstone pole contribution to the pseudoscalar vertex, at moderately large momenta. In the MSbar scheme at mu=2 GeV, from the GMOR formula we obtain <q qbar> = -(273 +/- 19 MeV)3. We show that the value extracted from the pseudoscalar vertex, <q qbar> = - (312 +/- 24 MeV)3, is consistent with the result obtained from the first (standard) method.
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