Heavy-quark physics with a tmQCD valence action
A. Bussone*, S. Chaves, G. Herdoiza, C. Pena, D. Preti, J.Á. Romero, J. Ugarrio on behalf of the ALPHA collaboration
May 29, 2019
We introduce a mixed-action approach based on CLS ensembles, where a valence $N_f$=2+1+1 Twisted Mass QCD action is combined with the $N_f$=2+1 non-perturbatively O$(a)$-improved Wilson sea sector. We show that for maximally twisted valence quarks, the automatic O$(a)$-improvement of this set-up holds up to lattice artifacts coming from sea quark mass effects. Furthermore, we introduce a three-dimensional Gradient Flow smearing in order to tame the signal to noise ratio problem.
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