胶子对g-2的影响：全息观点
Gluonic Effects on g-2: Holographic View
摘要：
基于与QCD的算子乘积展开相一致的显式胶子模全息模型，研究了强子首阶对轻子反常磁矩（g-2）的贡献的胶子凝聚效应.我们发现胶子增强HLO贡献μ子g-2约6%，这很好地填补了全息估计之间的差距，没有胶子效应和现象学的一个使用实验数据作为输入。类似的计算包括电子和τ轻子g-2的胶子效应也进行了良好的符合唯象估计。然后，我们将我们的全息估计应用于步行的Technicolor（WTC），其中大的技术胶子效应被证明是至关重要的Technicolon，（伪）Nambu-Goldstone玻色子的（近似）WTC的尺度对称性，自然轻至125 GeV。结果表明，techni-HLO对μ子g-2的贡献值通过包含与实现125 GeV Techniquenon的胶子效应相同数量的胶子效应而增强了10-100倍，尽管这样增强的techni-HLO贡献与当前μ子g-2的标准模型预测与实验的偏差相比仍然小得可以忽略不计.技术HLO的贡献的τ轻子g-2进行了讨论，提出了一个可能的唯象相关性进行测试，由未来的实验。
英文摘要：
We study "gluonic effects" (gluon condensation effects) on the hadronic leading order (HLO) contributions to the anomalous magnetic moment (g-2) of leptons, based on a holographic model having explicit gluonic mode introduced for consistency with the operator product expansion of QCD. We find gluonic enhancement of HLO contributions to the muon g-2 by about 6%, which nicely fills in the gap between the holographic estimate without gluonic effects and the phenomenological one using the experimental data as inputs. Similar calculations including the gluonic effects for the electron and the tau lepton g-2 are also carried out in good agreement with the phenomenological estimates. We then apply our holographic estimate to the Walking Technicolor (WTC) where large techni-gluonic effects were shown to be vital for the Technidilaton, (pseudo) Nambu-Goldstone boson of the (approximate) scale symmetry of WTC, to be naturally as light as 125 GeV. It is shown that the value of the techni-HLO contributions to the muon g-2 is 10-100 times enhanced by inclusion of the same amount of the gluonic effects as that realizing the 125 GeV Technidilaton, although such an enhanced techni-HLO contribution is still negligibly small compared with the current deviation of the Standard Model prediction of the muon g-2 from the experiments. The techni-HLO contributions to the tau lepton g-2 is also discussed, suggesting a possible phenomenological relevance to be tested by the future experiments.
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