We perform the scale setting procedure of a mixed action setup consisting of valence Wilson twisted mass fermions at maximal twist on CLS ensembles with Nf=2+1 flavours of 𝑂(𝑎)- improved Wilson sea quarks. We determine the gradient flow scale t₀ using pion and kaon masses and decay constants in the isospin symmetric limit of QCD as external physical input. We employ model variation techniques to probe the systematic uncertainties in the extraction of the ground state signal of lattice observables, as well as for the continuum-chiral extrapolations used to determine t₀ at the physical point.
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Saez-Gonzalvo et al. (2024) studied this question.
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