Comparison of the mixed-fermion-action effects using different fermion and gauge actions with 2 + 1 and 2 + 1 + 1 flavors
Abstract
The leading-order low-energy constant Δ mix in mixed-action chiral perturbation theory is calculated using 2 + 1 + 1 -flavor gauge ensembles with HISQ fermions and a tadpole-improved Symanzik gauge action at four lattice spacings a ∈ [ 0.048 , 0.111 ] fm . By comparing our results to those from different actions and a 2 + 1 -flavor case, We find that the fermion action has the dominant impact, the gauge action has a secondary but measurable effect, and the contribution from charm quark loops is negligible within our current uncertainties.
Fields of Study & Subjects
Quantum Chromodynamics and Particle Interactions
Particle physics theoretical and experimental studies
Neutrino Physics Research
Publication details
- Journal / source
- Physical review. D/Physical review. D.
- Publisher
- American Physical Society (APS)
- Volume
- 113
- Issue
- 5
- Publication date
- 27 February 2026
- Language
- EN