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Why rooting fails

Presenter: Michael Creutz — Brookhaven National Laboratory

I explore the origins of the unphysical predictions from rooted staggered fermion algorithms. Before rooting, the exact chiral symmetry of staggered fermions is a flavored symmetry among the four "tastes." The rooting procedure effectively averages over tastes of different chiralities. This averaging forbids the appearance of the correct 't Hooft vertex for the target theory.