Comparing RM123 and non-perturbative QCD+QED approaches to the HVP with C-periodic boundary conditions
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866913083013726208 |
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| author | Altherr, Anian Campos, Isabel Cotellucci, Alessandro Gruber, Roman Harris, Tim Komijani, Javad Margari, Francesca Marinkovic, Marina K. Parato, Letizia Patella, Agostino Rosso, Sara Tantalo, Nazario Tavella, Paola |
| author_facet | Altherr, Anian Campos, Isabel Cotellucci, Alessandro Gruber, Roman Harris, Tim Komijani, Javad Margari, Francesca Marinkovic, Marina K. Parato, Letizia Patella, Agostino Rosso, Sara Tantalo, Nazario Tavella, Paola |
| contents | Isospin-breaking corrections to the HVP are among the leading sources of uncertainty in the Standard Model prediction of the muon $g-2$. In recent work by the RC$^{\star}$ collaboration, 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 non-perturbative 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 $N_f =1+2+1$ 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. We summarize the comparison of the two approaches and discuss the implications for future lattice QCD+QED computations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_01085 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Comparing RM123 and non-perturbative QCD+QED approaches to the HVP with C-periodic boundary conditions Altherr, Anian Campos, Isabel Cotellucci, Alessandro Gruber, Roman Harris, Tim Komijani, Javad Margari, Francesca Marinkovic, Marina K. Parato, Letizia Patella, Agostino Rosso, Sara Tantalo, Nazario Tavella, Paola High Energy Physics - Lattice Isospin-breaking corrections to the HVP are among the leading sources of uncertainty in the Standard Model prediction of the muon $g-2$. In recent work by the RC$^{\star}$ collaboration, 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 non-perturbative 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 $N_f =1+2+1$ 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. We summarize the comparison of the two approaches and discuss the implications for future lattice QCD+QED computations. |
| title | Comparing RM123 and non-perturbative QCD+QED approaches to the HVP with C-periodic boundary conditions |
| topic | High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2605.01085 |