Heavy-quark physics with a tmQCD valence action

Bussone, Andrea; Chaves, Sergio; Herdoiza, Gregorio; Pena, Carlos; Preti, David; Romero, José Ángel; Ugarrio, Javier; on behalf of the ALPHA collaboration,

doi:10.22323/1.334.0270

Volume 334 - The 36th Annual International Symposium on Lattice Field Theory (LATTICE2018) - Weak Decays and Matrix Elements

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

*: corresponding author

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Published on: May 29, 2019

Abstract

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.

DOI: https://doi.org/10.22323/1.334.0270

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