Flavor symmetry breaking in mixed-action QCD

Details Flavor symmetry breaking in mixed-action QCD Flavor symmetry breaking in mixed-action QCD

2011-10-12

arxiv.org/abs/1110.2715v1

Physics

High Energy Physics

High Energy Physics - Lattice

6 pages, contribution to Lattice 2011

Scientific paper

We study the phase structure of mixed-action QCD with two Wilson sea quarks and two chiral valence quarks, starting from the chiral lagrangian. A priori, the effective theory allows for a rich phase structure, including a phase with a condensate made of sea and valence quarks. Because this would lead to mass eigenstates that are admixtures of sea and valence fields, pure-sea correlation functions would depend on valence quark masses, in contradiction with the actual setup of mixed-action simulations. Using properties of the chiral Dirac operator, we prove that such a phase does not occur, and that this leads to bounds on low-energy constants.

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