出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：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.
