Hadronic light-by-light contribution to the muon 
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 from holographic QCD with solved 
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Leutgeb, Josef; Mager, Jonas; Rebhan, Anton

doi:10.1103/physrevd.107.054021

Cited by 11 publications

(2 citation statements)

References 77 publications

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“…A dispersive analysis of kaon vector form factors [49] provided a tiny value for the kaon box, in line with previous estimates [34,46,50]. Axial-vector contributions and their interplay with SDCs have been studied within holographic QCD models [51][52][53]. The inclusion of axial-vector resonances within the dispersive framework became only possible with a modified tensor decomposition discussed in Ref.…”

Section: Martin Hoferichtersupporting

confidence: 76%

Theory of g-2

Hoferichter,

Colangelo,

Stoffer

2024

Proceedings of 16th International Conference on Heavy Quarks and Leptons — PoS(HQL2023)

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Section: Martin Hoferichtersupporting

confidence: 76%

Theory of g-2

Hoferichter,

Colangelo,

Stoffer

2024

Proceedings of 16th International Conference on Heavy Quarks and Leptons — PoS(HQL2023)

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“…A dispersive analysis of kaon vector form factors [48] provided a tiny value for the kaon box, in line with previous estimates [33,45,49]. Axial-vector contributions and their interplay with SDCs have been studied within holographic QCD models [50][51][52]. The inclusion of axial-vector resonances within the dispersive framework became only possible with a modified tensor decomposition discussed in Ref.…”

Section: Pos(fpcp2023)042supporting

confidence: 76%

Puzzles in the hadronic contributions to the muon anomalous magnetic moment

Colangelo,

Hoferichter,

Stoffer

2023

Proceedings of 21st Conference on Flavor Physics and CP Violation — PoS(FPCP2023)

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We summarize recent developments in the Standard-Model evaluation of the anomalous magnetic moment of the muon 𝑎 𝜇 , both in the hadronic-light-by-light and hadronic-vacuum-polarization contributions. The current situation for the latter is puzzling as we are confronted with multiple discrepancies that are not yet understood. We present updated fits of a dispersive representation of the pion vector form factor to the new CMD-3 data set and quantify the tensions with the other high-statistics 𝑒 + 𝑒 − → 𝜋 + 𝜋 − experiments in the contribution to 𝑎 𝜇 in the energy range up to 1 GeV, as well as in the corresponding contribution to the intermediate Euclidean window.

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Dispersion relations for hadronic light-by-light scattering in triangle kinematics

Lüdtke

Procura

Stoffer

2023

J. High Energ. Phys.

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We present a new strategy for the dispersive evaluation of the hadronic light-by-light contribution to the anomalous magnetic moment of the muon aμ. The new approach directly applies in the kinematic limit relevant for aμ: one of the photons is treated as an external electromagnetic field with vanishing momentum, so that the kinematics corresponds to a triangle. We derive expressions for the relevant single-particle intermediate states, as well as the tensor decompositions of the two-pion sub-processes that appear in addition to those needed in the established dispersive approach. The existing approach is based on a set of dispersion relations for the hadronic light-by-light tensor in four-point kinematics. At present it is not known how to consistently include in this framework resonant intermediate states of spin 2 or larger, due to the appearance of kinematic singularities that can be traced back to the redundancy of the tensor decomposition. We show that our new approach circumvents this problem and enables dispersion relations in the limit of triangle kinematics that are manifestly free from kinematic singularities, paving the way towards a data-driven evaluation of all relevant exclusive hadronic intermediate states.

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Hadronic light-by-light contribution to the muon g−2 from holographic QCD with solved U(1)A

Cited by 11 publications

References 77 publications

Theory of g-2

Theory of g-2

Puzzles in the hadronic contributions to the muon anomalous magnetic moment

Dispersion relations for hadronic light-by-light scattering in triangle kinematics

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