Continuum Limit of Overlap Valence Quarks on a Twisted Mass Sea
arXiv:1012.4412 · doi:10.1016/j.nuclphysb.2011.01.021
Abstract
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.
arXiv comment24 pages, 8 figures
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- Interpreting Numerical Measurements in Fixed Topological Sectors
- Extracting hadron masses from fixed topology simulations
- QCD Anderson transition with overlap valence quarks on a twisted-mass sea
- Comparison of different lattice definitions of the topological charge