Contribution to a conference proceedings/Contribution to a book

FZJ-2026-04943

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png An Update on the Isospin-Breaking Effects in the Pion Decay Constant with Staggered Quarks

Cotellucci, A. (Corresponding author)FZJ* ; Giusti, D.FZJ*

2026
SISSA Medialab Trieste Italy

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Please use a persistent id in citations: doi:10.22323/1.518.0235  doi:https://doi.org/10.22323/1.518.0235  doi:10.34734/FZJ-2026-04943

Abstract: We present an update on the ongoing computation of the isospin-breaking effects in the Pion Decay Constant from the BMW Collaboration. The calculation is carried out with $N_𝑓 =2+1+1$ staggered quarks with a near-physical pion mass and $\mathrm{QED}_L$. We give an update on the isosimmetric value and the current determination used to compute the gradient-flow scale $𝑤_0$, then we present some preliminary results of the valence-valence contribution to the axial-pseudoscalar correlator for different volumes and lattice spacings. We also discuss the next steps and plans.

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)

Research Program(s):

1. 5111 - Domain-Specific Simulation & Data Life Cycle Labs (SDLs) and Research Groups (POF4-511) (POF4-511)
2. MUON - Lattice determination of the muon's anomalous magnetic moment (101054515) (101054515)

Appears in the scientific report 2026

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