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Contribution of neutral pseudoscalar mesons to aμHLbL within a Schwinger-Dyson equations approach to QCD

机译:中性伪阶段的贡献在Schwinger-Dyson方程内的AμHLBL中的QCD方法

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A continuum approach to quantum chromodynamics (QCD), based upon Schwinger-Dyson (SD) and Bethe-Salpeter (BS) equations, is employed to provide a tightly constrained prediction for the γ * γ * → { π 0 , η , η ′ , η c , η b } transition form factors (TFFs) and their corresponding pole contribution to the hadronic light-by-light (HLbL) piece of the anomalous magnetic moment of the muon ( a μ ). This work relies on a practical and well-tested quark-photon vertex Ansatz approach to evaluate the TFFs for arbitrary spacelike photon virtualities, in the impulse approximation. The numerical results are parametrized meticulously, ensuring a reliable evaluation of the HLbL contributions to a μ . We obtain a μ π 0 ? pole = ( 6.14 ± 0.21 ) × 10 ? 10 , a μ η ? pole = ( 1.47 ± 0.19 ) × 10 ? 10 , a μ η ′ ? pole = ( 1.36 ± 0.08 ) × 10 ? 10 , yielding a total value of a μ π 0 + η + η ′ ? pole = ( 8.97 ± 0.48 ) × 10 ? 10 , compatible with contemporary determinations. Notably, we find that a μ η c + η b ? pole ≈ a μ η c ? pole = ( 0.09 ± 0.01 ) × 10 ? 10 , which might not be negligible once the percent precision in the computation of the light pseudoscalars is reached.
机译:甲连续方法量子色动力学,基于薛定谔-戴森(SD)和贝特 - 萨尔皮特(BS)方程中,采用以提供用于γ一个严格的限制预测*γ*→{π0,η,η' ,ηC,ηb}过渡形式因子(的TFF)和所述强子光通过光(结论HLBL)片μ介子(一个μ)的反常磁矩的它们的对应极的贡献。这项工作依赖于实际的和经过良好测试的夸克光子顶点拟设的方法来评估任意类空光子virtualities的的TFF,在冲量近似。数值结果精心参数化的,确保到μ结论HLBL贡献可靠的评估。我们获得μπ0?极=(6.14±0.21)×10? 10,μη?极=(1.47±0.19)×10? 10,μη'?极=(1.36±0.08)×10? 10,得到μ的合计值π0 +η+η'?极=(8.97±0.48)×10? 10,与现代兼容的确定。值得注意的是,我们发现,一个μηc +ηB?极≈一个μηC吗?极=(0.09±0.01)×10? 10,一旦达到在光赝纯量的计算百分比精确度可能是不可忽略的。

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