We discuss the recently proposed multiboson domain-decomposed factorization of the gauge-field dependence of the fermion determinant in lattice QCD. In particular, we focus on the case of a lattice divided in an arbitrary number of thick time slices. As a consequence, multiple space-time regions can be updated independently. This allows to address the exponential degradation of the signal-to-noise ration of correlation functions with multilevel Monte Carlo sampling. We show numerical evidence of the effectiveness of a two-level integration for pseudoscalar propagators with momentum and for vector propagators, in a two active regions setup. These results are relevant to lattice computation of the hadronic contributions to the anomalous magnetic moment of the muon and to heavy meson decay form factors.

Cè, M., Giusti, L., Schaefer, S. (2018). Local multiboson factorization of the quark determinant. Intervento presentato a: International Symposium on Lattice Field Theory (Lattice 2017), Granada, Spain [10.1051/epjconf/201817511005].

Local multiboson factorization of the quark determinant

Cè, M;Giusti, L;
2018

Abstract

We discuss the recently proposed multiboson domain-decomposed factorization of the gauge-field dependence of the fermion determinant in lattice QCD. In particular, we focus on the case of a lattice divided in an arbitrary number of thick time slices. As a consequence, multiple space-time regions can be updated independently. This allows to address the exponential degradation of the signal-to-noise ration of correlation functions with multilevel Monte Carlo sampling. We show numerical evidence of the effectiveness of a two-level integration for pseudoscalar propagators with momentum and for vector propagators, in a two active regions setup. These results are relevant to lattice computation of the hadronic contributions to the anomalous magnetic moment of the muon and to heavy meson decay form factors.
paper
Quantum Chromodynamics, Lattice gauge theory, Computational physics
English
International Symposium on Lattice Field Theory (Lattice 2017)
2017
Della Morte, M. et al.
2018
175
11005
open
Cè, M., Giusti, L., Schaefer, S. (2018). Local multiboson factorization of the quark determinant. Intervento presentato a: International Symposium on Lattice Field Theory (Lattice 2017), Granada, Spain [10.1051/epjconf/201817511005].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/214141
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