Bai-Long Hoid

activity

20182026

most citedThe anomalous magnetic moment of the muon in the Standard Model

1.2k citations · 2.6k across the 21 of their papers we have counts for

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20 papers · 1 filter

hep-ph2026

Dispersive analysis of the $J / ψ \to γ π^{0} π^{0}$ process

Bai-Long Hoid, Igor Danilkin, Anna Testa +1

We present a dispersive amplitude analysis of the low-energy $π^{0} π^{0}$ system in the radiative decay $J / ψ \to γ π^{0} π^{0}$ , using the mass-independent BESIII $0^{++}$ and $2^{++}$ intensi…

hep-ph2026

Dispersive analysis of the $ϕ \to γ π^{0} π^{0}$ process

Bai-Long Hoid, Igor Danilkin, Marc Vanderhaeghen

We present an analysis of the radiative decay $ϕ \to γ π^{0} π^{0}$ in a dispersive framework, where the two-pion subsystem undergoes strong final-state interactions that cover the $f_0(…

hep-ph2025★ 1 cited

Improved Standard-Model predictions for $η^{(')} \to ℓ^{+} ℓ^{-}$

Noah Messerli, Martin Hoferichter, Bai-Long Hoid +2

The rare decays $η^{(')} \to ℓ^{+} ℓ^{-}$ , $ℓ \in {e, μ}$ , are highly suppressed in the Standard Model, both by their chirality structure and the required loop attaching the…

hep-ph2025★ 134 cited

The anomalous magnetic moment of the muon in the Standard Model: an update

R. Aliberti, T. Aoyama, E. Balzani +232

We present the current Standard Model (SM) prediction for the muon anomalous magnetic moment, $a_{μ}$ , updating the first White Paper (WP20) [1]. The pure QED and electroweak contrib…

hep-ph2025★ 2 cited

Extracting the chiral anomaly from $e^{+} e^{-} \to 3 π$

Martin Hoferichter, Bai-Long Hoid, Bastian Kubis

The strength of the interaction of three pions and a photon, $F_{3 π}$ is predicted by the axial anomaly in terms of the pion decay constant, a relation that is frequently used to c…

hep-ph2025

Kaon Physics: A Cornerstone for Future Discoveries

Jason Aebischer, Atakan Tugberk Akmete, Riccardo Aliberti +153

The kaon physics programme, long heralded as a cutting-edge frontier by the European Strategy for Particle Physics, continues to stand at the intersection of discovery and innovati…

hep-ph2024★ 25 cited

Dispersion relation for hadronic light-by-light scattering: $η$ and $η^{'}$ poles

Simon Holz, Martin Hoferichter, Bai-Long Hoid +1

The pseudoscalar-pole contributions to hadronic light-by-light scattering are determined by the respective transition form factors (TFFs) into two virtual photons. These TFFs const…

hep-ph2024★ 16 cited

Precision evaluation of the $η$ - and $η^{'}$ -pole contributions to hadronic light-by-light scattering in the anomalous magnetic moment of the muon

Simon Holz, Martin Hoferichter, Bai-Long Hoid +1

Next to the $π^{0}$ pole, $η$ and $η^{'}$ intermediate states give rise to the leading singularities of the hadronic light-by-light tensor, resulting in sizable contributions to the ano…

hep-ph2023★ 4 cited

Workshop summary -- Kaons@CERN 2023

G. Anzivino, S. Arguedas Cuendis, V. Bernard +60

Kaon physics is at a turning point -- while the rare-kaon experiments NA62 and KOTO are in full swing, the end of their lifetime is approaching and the future experimental landscap…

hep-ph2023★ 10 cited

Improved Standard-Model prediction for $K_{L} \to ℓ^{+} ℓ^{-}$

Martin Hoferichter, Bai-Long Hoid, Jacobo Ruiz de Elvira

We present a comprehensive calculation of the $K_{L} \to γ^{*} γ^{*}$ form factor in dispersion theory, using input from the leptonic decays $K_{L} \to ℓ^{+} ℓ^{-} γ$ , $K_L\to \ell_1^+\ell_1^-\…

hep-ph2023★ 34 cited

Isospin-breaking effects in the three-pion contribution to hadronic vacuum polarization

Martin Hoferichter, Bai-Long Hoid, Bastian Kubis +1

Isospin-breaking (IB) effects are required for an evaluation of hadronic vacuum polarization at subpercent precision. While the dominant contributions arise from the $e^+e^-\toπ^+π…

hep-ph2023★ 37 cited

A phenomenological estimate of isospin breaking in hadronic vacuum polarization

Martin Hoferichter, Gilberto Colangelo, Bai-Long Hoid +5

Puzzles in the determination of the hadronic-vacuum-polarization contribution currently impede a conclusive interpretation of the precision measurement of the anomalous magnetic mo…

hep-ph2022

Chiral extrapolation of hadronic vacuum polarization and isospin-breaking corrections

Martin Hoferichter, Gilberto Colangelo, Bai-Long Hoid +4

By far the biggest contribution to hadronic vacuum polarization (HVP) arises from the two-pion channel. Its quark-mass dependence can be evaluated by combining dispersion relations…

hep-ph2022

Prospects for precise predictions of $a_{μ}$ in the Standard Model

G. Colangelo, M. Davier, A. X. El-Khadra +79

We discuss the prospects for improving the precision on the hadronic corrections to the anomalous magnetic moment of the muon, and the plans of the Muon $g - 2$ Theory Initiative to…

hep-ph2021★ 25 cited

Improved Standard-Model prediction for $π^{0} \to e^{+} e^{-}$

Martin Hoferichter, Bai-Long Hoid, Bastian Kubis +1

We present an improved Standard-Model (SM) prediction for the dilepton decay of the neutral pion. The loop amplitude is determined by the pion transition form factor for $π^0\toγ^*…

hep-ph2020★ 67 cited

Hadronic vacuum polarization and vector-meson resonance parameters from $e^{+} e^{-} \to π^{0} γ$

Bai-Long Hoid, Martin Hoferichter, Bastian Kubis

We study the reaction $e^{+} e^{-} \to π^{0} γ$ based on a dispersive representation of the underlying $π^{0} \to γ γ^{*}$ transition form factor. As a first application, we evaluate the contributi…

hep-ph2020★ 1.2k cited

The anomalous magnetic moment of the muon in the Standard Model

T. Aoyama, N. Asmussen, M. Benayoun +129

We review the present status of the Standard Model calculation of the anomalous magnetic moment of the muon. This is performed in a perturbative expansion in the fine-structure con…

hep-ph2019★ 430 cited

Three-pion contribution to hadronic vacuum polarization

Martin Hoferichter, Bai-Long Hoid, Bastian Kubis

We address the contribution of the $3 π$ channel to hadronic vacuum polarization (HVP) using a dispersive representation of the $e^{+} e^{-} \to 3 π$ amplitude. This channel gives the seco…

hep-ph2018★ 429 cited

Dispersion relation for hadronic light-by-light scattering: pion pole

Martin Hoferichter, Bai-Long Hoid, Bastian Kubis +2

The pion-pole contribution to hadronic light-by-light scattering in the anomalous magnetic moment of the muon $(g - 2)_{μ}$ is fully determined by the doubly-virtual pion transition fo…

hep-ph2018★ 163 cited

Pion-pole contribution to hadronic light-by-light scattering in the anomalous magnetic moment of the muon

Martin Hoferichter, Bai-Long Hoid, Bastian Kubis +2

The $π^{0}$ pole constitutes the lowest-lying singularity of the hadronic light-by-light (HLbL) tensor, and thus provides the leading contribution in a dispersive approach to HLbL sc…

Dispersive analysis of the J/ψ→γπ0π0 process

Dispersive analysis of the ϕ→γπ0π0 process

Improved Standard-Model predictions for η(′)→ℓ+ℓ−