Double poles in Lattice QCD with mixed actions

Details Double poles in Lattice QCD with mixed actions Double poles in Lattice QCD with mixed actions

2005-09-30

arxiv.org/abs/hep-lat/0509190v1

PoS LAT2005 (2005) 082; Nucl.Phys.Proc.Suppl. 153 (2006) 135-138

Physics

High Energy Physics

High Energy Physics - Lattice

8 pages; combined writeup of talks given at Lattice 2005 (Dublin) and the Workshop on Computational Hadron Physics (Cyprus)

Scientific paper

We consider effects resulting from the use of different discretizations for the valence and the sea quarks, 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 flavor non-diagonal Goldstone mesons made out of valence or sea quark have equal masses. We then consider some observables known to be anomalously sensitive to the presence of a double pole. We find that the double-pole enhanced scaling violations may turn out to be rather small in practice.

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