Topologically Unquenched QCD: Prospects from an explorative study in 2-flavour QED(2)

Abstract

The concept of simulating a variant of QCD with sea quarks which interact with the gluon configuration only via global gluonic quantities like $\int F\tilde{F}dx$ and $\int FFdx$ is tested for the case of the massive 2-flavour Schwinger model. It is found to amount to an importance sampling method which generates -at essentially the costs of a quenched run- an ensemble in between a full and a quenched one, thus providing a competitive alternative to the quenched approximation.

Comments: 15 pages, 10 figures, revision: mistake in scale of some figures corrected, few minor changes in text, physics unaltered -- to appear in Phys. Rev. D