How good is the quenched approximation of QCD?

Details How good is the quenched approximation of QCD? How good is the quenched approximation of QCD?

1994-05-03

arxiv.org/abs/hep-lat/9405002v2

Pramana 45 (1995) S141-S154

Physics

High Energy Physics

High Energy Physics - Lattice

22 pages, Wash. U. HEP/94-62 (Forgotten set of macros now included, sorry.)

Scientific paper

The quenched approximation for QCD is, at present and in the foreseeable future, unavoidable in lattice calculations with realistic choices of the lattice spacing, volume and quark masses. In this talk, I review an analytic study of the effects of quenching based on chiral perturbation theory. Quenched chiral perturbation theory leads to quantitative insight on the difference between quenched and unquenched QCD, and reveals clearly some of the diseases which are expected to plague quenched QCD. Uses jnl.tex and epsf.tex for figure 3. Figures 1 and 2 not included, sorry. Available as hardcopy on request.

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