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arXiv 2104.04503hep-ph
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用最近的μ子$(g-2)$和希格斯奇异衰变测量揭示暗物质

Shedding light on dark matter with recent muon $(g-2)$ and Higgs exotic decay measurements

Chih-Ting Lu, Raymundo Ramos, Yue-Lin Sming Tsai

摘要:

最近,我们已经看到了两个超越标准模型的物理学线索:在寻找$H_0\to A_0 A_0\to b\bar{b}μ^{+}μ^{-}$的过程中,$σ$局部过剩($M_{A_0} = 52$ GeV)为3.3,在$(g-2)_μ$测量中,$σ$偏离SM预测为4.2。ATLAS协作组使用$\sqrt{s}=13$ TeV的139 fb $^{-1}$数据发现了第一个过剩。第二个偏差是布鲁克海文E821和最近报道的费米实验室E989实验结果的结合。我们试图用一个可重正化的简化暗物质模型来解释这些偏差。受暗物质(DM)直接探测的零信号结果的启发,我们将可能的新粒子$A_0$解释为连接DM和标准模型的赝标介体。另一方面,一种新的矢量类μ轻子可以同时解释这两种过剩现象,并对DM现象作出贡献。

英文摘要:

Recently, we have witnessed two hints of physics beyond the standard model: A 3.3$σ$ local excess ($M_{A_0} = 52$ GeV) in the search for $H_0\to A_0 A_0\to b\bar{b}μ^{+}μ^{-}$ and a 4.2$σ$ deviation from the SM prediction in the $(g-2)_μ$ measurement. The first excess was found by the ATLAS Collaboration using 139 fb$^{-1}$ data at $\sqrt{s}=13$ TeV. The second deviation is a combination of the results from the Brookhaven E821 and the recently reported Fermilab E989 experiment. We attempt to explain these deviations in terms of a renormalizable simplified dark matter model. Inspired by the null signal result from dark matter (DM) direct detection, we interpret the possible new particle, $A_0$, as a pseudoscalar mediator connecting DM and the standard model. On the other hand, a new vector-like muon lepton can explain these two excesses at the same time while contributiong to the DM phenomenology.

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