Extended Double Lattice BRST, Curci-Ferrari Mass and the Neuberger Problem
M. Ghiotti, L. von Smekal, A. G. Williams
Abstract
We present Extended Double BRST on the lattice and extend the Neuberger problem to include the ghost/anti-ghost symmetric formulation of the non-linear covariant Curci-Ferrari (CF) gauges. We then show how a CF mass regulates the 0/0 indeterminate form of physical observables, as observed by Neuberger, and discuss the gauge-parameter and mass dependence of the model.
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