A tree-level Naik improvement of the Karsten-Wilczek lattice fermion action reduces taste breaking and noise in mixed-action tests, bringing its continuum pion decay constant in line with staggered results.
In princple, each bare parame- ters have to be retuned at a new choice of the smearing level
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Taste breaking in the minimally doubled Karsten-Wilczek action and its tree-level improvement
A tree-level Naik improvement of the Karsten-Wilczek lattice fermion action reduces taste breaking and noise in mixed-action tests, bringing its continuum pion decay constant in line with staggered results.