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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.14891 |
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| _version_ | 1866917413643091968 |
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| author | Rebhan, Anton Cappiello, Luigi Leutgeb, Josef Mager, Jonas |
| author_facet | Rebhan, Anton Cappiello, Luigi Leutgeb, Josef Mager, Jonas |
| contents | We review the recent progress made with regard to the hadronic light-by-light (HLbL) contribution to the Standard Model prediction of the muon anomalous magnetic moment and how well this compares with predictions from holographic QCD models, which had predicted larger contributions from axial vector mesons and short-distance constraints than the White Paper of 2020. A new holographic prediction concerns tensor-meson contributions, which in holographic QCD play a significant role in short-distance constraints beyond the Melnikov-Vainshtein constraint. When matching also the symmetric longitudinal short-distance constraint, the resulting prediction for the tensor-meson transition form factors agree well with available singly virtual data, but lead to different results than the traditional quark-model ansatz and a sizable positive contribution that could explain the remaining current tension between lattice and data-driven results for the HLbL contribution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_14891 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Status of the hadronic light-by-light contribution to the muon $g-2$ and holographic QCD predictions Rebhan, Anton Cappiello, Luigi Leutgeb, Josef Mager, Jonas High Energy Physics - Phenomenology We review the recent progress made with regard to the hadronic light-by-light (HLbL) contribution to the Standard Model prediction of the muon anomalous magnetic moment and how well this compares with predictions from holographic QCD models, which had predicted larger contributions from axial vector mesons and short-distance constraints than the White Paper of 2020. A new holographic prediction concerns tensor-meson contributions, which in holographic QCD play a significant role in short-distance constraints beyond the Melnikov-Vainshtein constraint. When matching also the symmetric longitudinal short-distance constraint, the resulting prediction for the tensor-meson transition form factors agree well with available singly virtual data, but lead to different results than the traditional quark-model ansatz and a sizable positive contribution that could explain the remaining current tension between lattice and data-driven results for the HLbL contribution. |
| title | Status of the hadronic light-by-light contribution to the muon $g-2$ and holographic QCD predictions |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2604.14891 |