# The 35th International Symposium on Lattice Field Theory

18-24 June 2017
Palacio de Congresos
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# Contribution Parallel

Seminarios 6+7
Weak Decays and Matrix Elements

# Setting up a tmQCD valence action for flavour physics

## Speakers

• Mr. Jose Angel ROMERO JURADO

## Content

We discuss a mixed-action approach in which sea quarks are regularized using non-perturbatively $O(a)$ improved Wilson fermions, while an $N_f=2+1+1$ fully-twisted tmQCD action is used for valence quarks. In this setup automatic O(a) improvement is preserved for valence observables, apart from small residual O(a) effects from the sea. An optimal strategy for matching sea and valence is set up, and carried out for $N_f=2+1$ CLS ensembles with open boundary conditions at several simulation points.

## Preferred track (if multiple tracks have been selected)

Weak Decays and Matrix Elements