The role of the double pole in lattice QCD with mixed actions

Details The role of the double pole in lattice QCD with mixed actions The role of the double pole in lattice QCD with mixed actions

2005-04-14

arxiv.org/abs/hep-lat/0504013v1

Phys.Rev. D71 (2005) 114508

Physics

High Energy Physics

High Energy Physics - Lattice

13 pages

Scientific paper

10.1103/PhysRevD.71.114508

We investigate effects resulting from the use of different discretizations for the valence and the sea quarks in lattice QCD, considering Wilson and/or Ginsparg-Wilson fermions. We assume that such effects appear through scaling violations that can be studied using effective lagrangian techniques. We show that a double pole is present in flavor-neutral Goldstone meson propagators,even if the charged Goldstone mesons made out of valence quarks and those made out of sea quarks have equal masses. We then consider some observables known to be anomalously sensitive to the presence of a double pole. For these observables, we find that the double-pole enhanced scaling violations may turn out to be rather small in practice.

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