论文标题
HADRONIC真空两极分化：$（G-2）_μ$与全球electroweak拟合
Hadronic vacuum polarization: $(g-2)_μ$ versus global electroweak fits
论文作者
论文摘要
HADRONIC真空极化（HVP）不仅是标准模型（SM）预测的关键部分（MUON $（G-2）_μ$的异常磁矩，而且还是全球拟合电动型（EW）精确度的关键成分，这是由于其对精美的构造常数构造常数的贡献而导致的， $Δα^{（5）} _ \ text {hove} $。我们发现，通过现代EW精度数据，包括Higgs质量的测量，仅全球拟合提供了$Δα^{（5）} _ \ text {hast} \ big | _ \ big | _ \ text {ew} = 270.2（3.0）\ times \ times \ times \ times 10^{ - 4} $。该值实际上位于$ e^+e^ - \ to \ text {hadrons} $横截面数据的范围以下，因此，如果HVP的更改将SM预测带来$（g-2）_ $与Brookhaven测量的一致性，则朝相反的方向迈进了相反的方向。取决于横截面中大部分变化发生的能量，通过调整HVP来调和实验和SM预测以$（g-2）_ $进行调解，因此不一定会削弱SM（BSM）以外的物理学的情况，但在某种程度上，它将其从$（G-2）_ $转移到eW fit。我们简要探讨了BSM方案的一些选择，可以想象可以解释随后的紧张局势。
Hadronic vacuum polarization (HVP) is not only a critical part of the Standard Model (SM) prediction for the anomalous magnetic moment of the muon $(g-2)_μ$, 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 $Δα^{(5)}_\text{had}$. 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 $Δα^{(5)}_\text{had}\big|_\text{EW}=270.2(3.0)\times 10^{-4}$. This value actually lies below the range derived from $e^+e^-\to\text{hadrons}$ 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 $(g-2)_μ$ 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 prediction for $(g-2)_μ$ by adjusting HVP would thus not necessarily weaken the case for physics beyond the SM (BSM), but to some extent shift it from $(g-2)_μ$ to the EW fit. We briefly explore some options of BSM scenarios that could conceivably explain the ensuing tension.
