Kaon-box contribution to the anomalous magnetic moment of the muon

Eichmann, Gernot; Fischer, Christian; Williams, Richard

doi:10.1103/physrevd.101.054015

Cited by 102 publications

(74 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, major progress has been made in determining the hadronic light-by-light (LbL) contribution, a had;LbL μ , from dispersive approaches and from LQCD. The latest datadriven and dispersive hadronic LbL results [26][27][28][29][30][31]33,[47][48][49][50][51][52][53][54][55][56][57] and first complete LQCD evaluation [32] confirm the previously accepted model-based "Glasgow consensus" result [58], thereby eliminating the hadronic LbL sector as the source of the muon g − 2 discrepancy. This leaves the hadronic vacuum polarization (VP) contributions, a had;VP μ , as the remaining SM candidate to explain Δa μ .…”

Section: Introductionsupporting

confidence: 68%

Muon g−2 and Δα connection

et al. 2020

View full text Add to dashboard Cite

The discrepancy between the Standard Model theory and experimental measurement of the muon magnetic moment anomaly, a μ ¼ ðg μ − 2Þ=2, is connected to precision electroweak (EW) predictions via their common dependence on hadronic vacuum polarization effects. The same data for the total e þ e − → hadrons cross section, σ had ðsÞ, are used as input into dispersion relations to estimate the hadronic vacuum polarization contributions, a had;VP

show abstract

Section: Introductionsupporting

confidence: 68%

Muon g−2 and Δα connection

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Heavier intermediate states have been considered in refs. [29][30][31][32][33][34]. The heavy-quark contribution from charm is sufficiently well estimated from the quark loop and estimates of non-perturbative contributions and that of the bottom and top quarks are negligible [1,[35][36][37].…”

Section: Jhep04(2021)240mentioning

confidence: 78%

The two-loop perturbative correction to the (g − 2)μ HLbL at short distances

Bijnens

Hermansson-Truedsson

Laub

et al. 2021

J. High Energ. Phys.

View full text Add to dashboard Cite

The short-distance behaviour of the hadronic light-by-light (HLbL) contribution to (g − 2)μ has recently been studied by means of an operator product expansion in a background electromagnetic field. The leading term in this expansion has been shown to be given by the massless quark loop, and the non-perturbative corrections are numerically very suppressed. Here, we calculate the perturbative QCD correction to the massless quark loop. The correction is found to be fairly small compared to the quark loop as far as we study energy scales where the perturbative running for the QCD coupling is well-defined, i.e. for scales μ ≳ 1 GeV. This should allow to reduce the large systematic uncertainty associated to high-multiplicity hadronic states.

show abstract

“…[49][50][51][52], the ultimate precision expected from the Fermilab [53] and J-PARC [54] experiments demands that also the second-most-uncertain contribution, hadronic light-by-light (HLbL) scattering, be further improved. The uncertainty of the current phenomenological estimate, a HLbL µ = 92(19) × 10 −11 [9,[22][23][24][25][26][27][28][29][30][31][55][56][57][58][59][60], is dominated by the intermediate-and high-energy regions of the loop integral. In fact, while at low energies the few dominant hadronic channels can be taken into account explicitly in a dispersive approach [61][62][63][64][65] -in terms of pseudoscalar TFFs and partial-wave amplitudes for γ * γ * → ππ [66][67][68][69][70][71] -between (1-2) GeV multi-hadron channels become relevant, which ultimately need to be matched to short-distance constraints for the HLbL amplitude [22,[29][30][31][72][73][74][75][76].…”

Section: Introductionmentioning

confidence: 93%

On the transition form factors of the axial-vector resonance f1(1285) and its decay into e+e−

Zanke¹,

Hoferichter

Kubis³

2021

J. High Energ. Phys.

View full text Add to dashboard Cite

Estimating the contribution from axial-vector intermediate states to hadronic light-by-light scattering requires input on their transition form factors (TFFs). Due to the Landau–Yang theorem, any experiment sensitive to these TFFs needs to involve at least one virtual photon, which complicates their measurement. Phenomenologically, the situation is best for the f1(1285) resonance, for which information is available from e+e− → e+e−f1, f1 → 4π, f1 → ργ, f1 → ϕγ, and f1 → e+e−. We provide a comprehensive analysis of the f1 TFFs in the framework of vector meson dominance, including short-distance constraints, to determine to which extent the three independent TFFs can be constrained from the available experimental input — a prerequisite for improved calculations of the axial-vector contribution to hadronic light-by-light scattering. In particular, we focus on the process f1 → e+e−, evidence for which has been reported recently by SND for the first time, and discuss the impact that future improved measurements will have on the determination of the f1 TFFs.

show abstract

Kaon-box contribution to the anomalous magnetic moment of the muon

Cited by 102 publications

References 58 publications

Muon g−2 and Δα connection

Muon g−2 and Δα connection

The two-loop perturbative correction to the (g − 2)μ HLbL at short distances

On the transition form factors of the axial-vector resonance f1(1285) and its decay into e+e−

Contact Info

Product

Resources

About