# The 39th International Symposium on Lattice Field Theory (Lattice 2022)

Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

## Scale setting from a mixed action with Wilson twisted mass valence quarks

Aug 10, 2022, 2:20 PM
20m
CP1-HSZ/Ground-0.002 - HS4 (CP1-HSZ)

### CP1-HSZ/Ground-0.002 - HS4

#### CP1-HSZ

50
Oral Presentation Standard Model Parameters

### Speaker

Alejandro Saez (IFT UAM-CSIC)

### Description

We present preliminary results for a scale setting procedure based on a mixed action strategy, consisting of Wilson twisted mass valence fermions at maximal twist on CLS ensembles with $N_f=2+1$ flavours of O(a)-improved Wilson sea quarks. Once the matching of valence and sea quark masses is performed, universality tests are carried out by comparing the continuum-limit results of the mixed action setup to those of the regularisation based solely on O(a)-improved Wilson fermions. The scale setting uses the pion and kaon decay constants, in units of flow scale $t_0$, obtained from combining computations with the unitary Wilson action and the mixed action. The proper isolation of ground states as well as the continuum-chiral extrapolations are evaluated through model variation techniques. An update on the determination of $t_0$ will be presented.

### Primary author

Alejandro Saez (IFT UAM-CSIC)

### Co-authors

Gregorio Herdoiza (Instituto de Física Teórica UAM-CSIC) Alessandro Conigli (IFT UAM-CSIC) Julien Frison (DESY ZPPT/NIC) Carlos Pena (IFT UAM-CSIC) Javier Ugarrio (IFT UAM-CSIC)