Quantum Physics Division
Faculty of PhysicsAdam Mickiewicz University

Overlap valence quarks on a twisted mass sea: a case study for mixed action Lattice QCD

K. Cichy1,2 , V. Drach1 , E. Garcia-Ramos 1,3 , G. Herdoíza 4 , K. Jansen1

2 Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614, Poznan, Poland
3 Humboldt Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany
1 NIC, DESY Zeuthen, Platanenallee 6, 15738 Zeuthen, Germany
4 Departamento de Física Teórica and Instituto de Física Teórica, UAM/CSIC, Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain

Nuclear Physics B, 869,131-163 (2013)


We discuss a lattice QCD mixed action investigation employing Wilson maximally twisted mass sea and overlap valence fermions. Using four values of the lattice spacing, we demonstrate that the overlap Dirac operator assumes a point-like locality in the continuum limit. We also show that by adopting suitable match- ing conditions for the sea and valence theories a consistent continuum limit for the pion decay constant and light baryon masses can be obtained. Finally, we confront results for sea–valence mixed meson masses and the valence scalar correlator with corresponding expressions of chiral perturbation theory. This allows us to extract low energy constants of mixed action chiral perturbation which characterize the strength of unitarity violations in our mixed action setup


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