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arXiv 1012.4412hep-lat
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扭曲质量海上重叠价夸克的连续极限

Continuum Limit of Overlap Valence Quarks on a Twisted Mass Sea

Krzysztof Cichy, Gregorio Herdoiza, Karl Jansen

摘要:

研究了重叠价夸克对两种Wilson最大扭曲质量海夸克的格点量子色动力学混合作用。采用三种不同的匹配条件,这两个行动相互关联,我们调查的连续极限,通过使用三个值的晶格间距范围从0.05 fm到0.08 fm。特别强调了价重叠算符中出现的拓扑零模对物理观测量的影响。我们估计的区域的参数空间中,这些零模式的贡献是足够小,使他们的影响可以安全地控制和恢复的统一性的混合行动在连续极限达到。

英文摘要:

We study a lattice QCD mixed action with overlap valence quarks on two flavours of Wilson maximally twisted mass sea quarks. Employing three different matching conditions to relate both actions to each other, we investigate the continuum limit by using three values of the lattice spacing ranging from 0.05 fm to 0.08 fm. A particular emphasis is put on the effect on physical observables of the topological zero modes appearing in the valence overlap operator. We estimate the region of parameter space where the contribution from these zero modes is sufficiently small such that their effects can be safely controlled and a restoration of unitarity of the mixed action in the continuum limit is reached.

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