Speaker
Description
Isospin-breaking corrections to the HVP are among the leading sources of uncertainty in the Standard Model prediction of the muon g−2 [1]. In recent work by the RC* collaboration [1], we compute the intermediate window contribution for a flavour non-singlet current using two strategies to include isospin-breaking corrections: the RM123 approach and a fully dynamical QCD+QED simulation. In both computations, we use C-periodic spatial boundary conditions to ensure that locality, gauge invariance, and translational invariance are preserved throughout the calculation. At fixed lattice spacing and volume with Nf =1+2+1 dynamical fermions, and fully including sea-quark effects in both computations, we find that simulating the full QCD+QED distribution yields smaller uncertainties for a fixed statistics. I will present the comparison of the two approaches and discuss the implications for future lattice QCD+QED computations.
[1] arXiv:2505.21476 [hep-ph]
[2] arXiv:2506.19770v1 [hep-lat]
| Parallel Session (for talks only) | Quark and lepton flavor physics |
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