标题： 具有混合作用的晶格QCD中双极子的作用 显示英文标题

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

摘要： 我们研究了在格点QCD中用于味夸克和海夸克的不同离散化方法所产生的影响，考虑了Wilson和/或Ginsparg-Wilson费米子。 我们假设这些影响会通过标度违例表现出来，可以通过有效拉格朗日技术进行研究。 我们证明了即使由味夸克组成的中性Goldstone介子和由海夸克组成的中性Goldstone介子具有相同的质量，在中性Goldstone介子传播子中仍然存在双重极点。 然后我们考虑了一些已知对双重极点异常敏感的可观测量。 对于这些可观测量，我们发现双重极点增强的标度违例在实际中可能相当小。 显示英文摘要

摘要： 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.