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arXiv 2104.03259hep-phhep-ex
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异常中介中的μ子$g-2$异常

Muon $g-2$ Anomaly in Anomaly Mediation

Wen Yin

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12 pages, 3 figures; version to appear in JHEP
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摘要：

长期存在的μ介子$g-2$异常最近在费米实验室得到了证实。Fermilab和Brookhaven结果的组合差异显示与理论的差异显著性为4.2 $σ$。此外，LHC还更新了纯wino的质量下限。在这封信中，我们研究了在异常调解场景中可以在多大程度上解释$g-2$，其中纯维诺是主要的暗物质成分。为此，我们推导出一些模型无关的粒子谱和$g-2$的约束。我们发现，$g-2$解释在1 $σ$水平被驱动到一个角落，如果higgsino阈值校正被抑制。相反，如果阈值校正是相当大的，则可以解释$g-2$。在整个可行参数范围内，胶子质量最大为$2-4\,$ TeV，比诺质量最大为$2\,$ TeV，维诺暗物质质量最大为$1-2\,$ TeV.如果μ子$g-2$异常在异常调解方案中得到解释，碰撞机和间接搜索暗物质可能会在不久的将来找到更多的证据。可能的UV模型的大阈值校正进行了讨论。

英文摘要：

The long-standing muon $g-2$ anomaly has been confirmed recently at the Fermilab. The combined discrepancy from Fermilab and Brookhaven results shows a difference from the theory at a significance of 4.2 $σ$. In addition, the LHC has updated the lower mass bound of a pure wino. In this letter, we study to what extent the $g-2$ can be explained in anomaly mediation scenarios, where the pure wino is the dominant dark matter component. To this end, we derive some model-independent constraints on the particle spectra and $g-2$. We find that the $g-2$ explanation at the 1$σ$ level is driven into a corner if the higgsino threshold correction is suppressed. On the contrary, if the threshold correction is sizable, the $g-2$ can be explained. In the whole viable parameter region, the gluino mass is at most $2-4\,$TeV, the bino mass is at most $2\,$TeV, and the wino dark matter mass is at most $1-2\,$TeV. If the muon $g-2$ anomaly is explained in the anomaly mediation scenarios, colliders and indirect search for the dark matter may find further pieces of evidence in the near future. Possible UV models for the large threshold corrections are discussed.

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