Estimate of the chiral condensate in quenched lattice QCD

Details Estimate of the chiral condensate in quenched lattice QCD Estimate of the chiral condensate in quenched lattice QCD

2004-03-04

arxiv.org/abs/hep-ph/0403044v2

Phys.Lett. B600 (2004) 83-90

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 2 figures [version published in PLB]

Scientific paper

10.1016/j.physletb.2004.07.065

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 = -(273 +/- 19 MeV)^3. We show that the value extracted from the pseudoscalar vertex, = - (312 +/- 24 MeV)^3, is consistent with the result obtained from the first (standard) method.

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