Hadronic vacuum polarization contribution to the muon 
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 with (
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)-flavor lattice QCD on a larger than 
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Shintani, Eigo; Kuramashi, Y.

doi:10.1103/physrevd.100.034517

Cited by 82 publications

(72 citation statements)

References 53 publications

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“…(7).] However, we stress that our results are relevant for any of the forthcoming precision calculations of HVP in lattice QCD, especially in view of the fact that the current average a HVP μ ¼ 711.6ð18.4Þ × 10 −10 [20, [98][99][100][101][102][103][104][105][106] also suggests a bigger central value, albeit with sufficiently large uncertainties to be consistent with the e þ e − value.…”

mentioning

confidence: 63%

Hadronic Vacuum Polarization:(g−2)μversus Global Electroweak Fits

et al. 2020

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Hadronic vacuum polarization (HVP) is not only a critical part of the standard model (SM) prediction for the anomalous magnetic moment of the muon ðg − 2Þ μ , but also a crucial ingredient for global fits to electroweak (EW) precision observables due to its contribution to the running of the fine-structure constant encoded in Δα ð5Þ had. We find that with modern EW precision data, including the measurement of the Higgs mass, the global fit alone provides a competitive, independent determination of Δα ð5Þ had j EW ¼ 270.2ð3.0Þ × 10 −4. This value actually lies below the range derived from e þ e − → hadrons cross section data, and thus goes into the opposite direction as would be required if a change in HVP were to bring the SM prediction for ðg − 2Þ μ into agreement with the Brookhaven measurement. Depending on the energy where the bulk of the changes in the cross section occurs, reconciling experiment and SM predictions for ðg − 2Þ μ by adjusting HVP would thus not necessarily weaken the case for physics beyond the SM (BSM), but to some extent shift it from ðg − 2Þ μ to the EW fit. We briefly explore some options of BSM scenarios that could conceivably explain the ensuing tension.

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confidence: 63%

Hadronic Vacuum Polarization:(g−2)μversus Global Electroweak Fits

et al. 2020

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“…Recently, renewed interest in the electromagnetic properties of axial-vector resonances has been triggered by hadronic corrections to the anomalous magnetic moment of the muon, with the current Standard-Model prediction , differing from experiment [34][35][36][37][38], a exp µ = 116 592 061(41) × 10 −11 , (1.2) by 4.2σ. While at present the uncertainty is dominated by hadronic vacuum polarization, with an emerging tension between the determination from e + e − data [9,[14][15][16][17][18][19][20] and lattice QCD [9,[39][40][41][42][43][44][45][46][47][48], see refs. [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.…”

Section: Introductionmentioning

confidence: 99%

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.

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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.

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“…Since the main branching ratios were precisely measured at LEP in very clean experimental conditions and without any need for an external normalization, this discrepancy seems to signal unaccounted systematics in the + − data. This conclusion is further reinforced by the most recent lattice determinations of the LO hadronic vacuum polarization contribution to the muon − 2 [243][244][245][246][247][248][249][250][251], which find values slightly higher than the dispersive + − results and in better agreement with the -based determination [242].…”

Section: Finite-energy Sum Rules With Electron-positron Datamentioning

confidence: 68%

Precision physics with QCD

Pich

2017

EPJ Web Conf.

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Abstract. The four-loop determination of the strong coupling from fully inclusive observables is reviewed. Special attention is given to the low-energy measurement extracted from the hadronic τ decay width. A recent exhaustive analysis of the ALEPH data, exploring several complementary methodologies with very different sensitivities to inverse power corrections and duality violations, confirms the strong suppression of nonperturbative contributions to R τ . It gives the value α s (m 2 τ ) = 0.328 ± 0.013, which implies α s (M 2 Z ) = 0.1197 ± 0.0015. The excellent agreement with the direct measurement at the Z peak, α s (M 2 Z ) = 0.1196 ± 0.0030, provides a beautiful test of asymptotic freedom. Together with the most recent lattice average from FLAG and the NNLO determinations from e + e − , PDFs and collider data quoted by the PDG, these two inclusive determinations imply a world average value α s (M 2 Z ) = 0.1180 ± 0.0010.

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Hadronic vacuum polarization contribution to the muon g−2 with ( 2+1 )-flavor lattice QCD on a larger than

Cited by 82 publications

References 53 publications

Hadronic Vacuum Polarization:(g−2)μversus Global Electroweak Fits

Hadronic Vacuum Polarization:(g−2)μversus Global Electroweak Fits

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

Precision physics with QCD

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