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.
24 pages, 8 figures
References in corpus (11)
- Light hadrons from lattice QCD with light (u,d), strange and charm dynamical quarks
- Lattice gauge action suppressing near-zero modes of H_W
- Overlap Valence on 2+1 Flavor Domain Wall Fermion Configurations with Deflation and Low-mode Substitution
- Two-flavor QCD simulation with exact chiral symmetry
- f_K/f_pi in Full QCD with Domain Wall Valence Quarks
- BK-parameter from Nf = 2 twisted mass lattice QCD
- Discretization effects and the scalar meson correlator in mixed-action lattice simulations
- Twisted Mass, Overlap and Creutz Fermions: Cut-off Effects at Tree-level of Perturbation Theory
- Probing the chiral regime of Nf=2 QCD with mixed actions
- Topological tunneling with Dynamical overlap fermions
- A comparison of the cut-off effects for Twisted Mass, Overlap and Creutz fermions at tree-level of Perturbation Theory