Systematic errors in partially-quenched QCD plus QED lattice simulations

Antonin Portelli (1, 2) , Stephan Dürr (3, 4) , Zoltán Fodor (3, 5, 4) , Julien Frison (1, 2) , Christian Hoelbling (3) , Sandor D. Katz (5) , Stefan Krieg (3, 4) , Thorsten Kurth (3) , Laurent Lellouch (2, 1) , Thomas Lippert (3, 4) , Alberto Ramos (1, 2) , Kálmán K. Szabó (3)

1 CPT - Centre de Physique Théorique - UMR 7332
2 CPT - E1 Physique des particules
3 Theoretische Teilchenphysik
4 JSC - Jülich Supercomputing Centre
5 Departement for Theoretical Physics

At the precision reached in current lattice QCD calculations, electromagnetic effects are becoming numerically relevant. Here, electromagnetic effects are included by superimposing $\mathrm{U}(1)$ degrees of freedom on $N_f = 2+1$ QCD configurations from the Budapest-Marseille-Wuppertal Collaboration. We present preliminary results for the electromagnetic corrections to light pseudoscalars mesons masses and discuss some of the associated systematic errors.

Domaines: Physique des Hautes Energies - Réseau [hep-lat]

Antonin Portelli, Stephan Dürr, Zoltán Fodor, Julien Frison, Christian Hoelbling, et al.. Systematic errors in partially-quenched QCD plus QED lattice simulations. 29th International Symposium on Lattice Field Theory (Lattice 2011), Jul 2011, Squaw Valley, United States. pp.136. ⟨hal-01258111⟩