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根据FNAL μ子$g-2$测量对$a_μ$的新物理解释

New physics explanations of $a_μ$ in light of the FNAL muon $g-2$ measurement

Peter Athron, Csaba Balázs, Douglas HJ Jacob, Wojciech Kotlarski, Dominik Stöckinger, Hyejung Stöckinger-Kim

摘要:

费米实验室的μ子$g-2$实验最近报告了它对反常磁矩$a_μ^{\textrm{FNAL}}$的第一次测量,这与之前的BNL测量完全一致,并将世界平均偏差$Δa_μ^{2021}$从标准模型推到了$4.2σ$的重要性。在这里,我们提供了一个广泛的调查,其影响超越标准模型物理。我们使用最先进的计算和一套复杂的工具来预测$a_μ$,暗物质和大型强子对撞机搜索在广泛的简单模型与多达三个新的领域,这代表了一些大$Δa_μ$可以解释的方式。此外,特别是动机良好的最小超对称标准模型,我们详尽地涵盖的情况下,大$Δa_μ$可以解释,同时满足所有相关的数据从其他实验。一般来说,$Δa_μ$的结果只能用相当小的质量和/或大的耦合和增强的手征翻转来解释,这可能导致与LHC和暗物质实验的限制相冲突。我们的研究结果表明,新的测量排除了大量的模型,并提供了关键的约束别人。双希格斯二重态和轻夸克模型只能在特定的版本和特定的参数范围内对$a_μ$提供可行的解释。在所有具有三个场的模型中,只有手征增强的模型才能同时容纳$a_μ$和暗物质。MSSM可以同时解释$a_μ$和暗物质在几个共湮灭区的类Bino LSP。在暗物质遗迹密度充足的情况下,希格斯诺-特别是类似维诺的LSP情景成为$a_μ$结果的有希望的解释。

英文摘要:

The Fermilab Muon $g-2$ experiment recently reported its first measurement of the anomalous magnetic moment $a_μ^{\textrm{FNAL}}$, which is in full agreement with the previous BNL measurement and pushes the world average deviation $Δa_μ^{2021}$ from the Standard Model to a significance of $4.2σ$. Here we provide an extensive survey of its impact on beyond the Standard Model physics. We use state-of-the-art calculations and a sophisticated set of tools to make predictions for $a_μ$, dark matter and LHC searches in a wide range of simple models with up to three new fields, that represent some of the few ways that large $Δa_μ$ can be explained. In addition for the particularly well motivated Minimal Supersymmetric Standard Model, we exhaustively cover the scenarios where large $Δa_μ$ can be explained while simultaneously satisfying all relevant data from other experiments. Generally, the $Δa_μ$ result can only be explained by rather small masses and/or large couplings and enhanced chirality flips, which can lead to conflicts with limits from LHC and dark matter experiments. Our results show that the new measurement excludes a large number of models and provides crucial constraints on others. Two-Higgs doublet and leptoquark models provide viable explanations of $a_μ$ only in specific versions and in specific parameter ranges. Among all models with up to three fields, only models with chirality enhancements can accommodate $a_μ$ and dark matter simultaneously. The MSSM can simultaneously explain $a_μ$ and dark matter for Bino-like LSP in several coannihilation regions. Allowing under abundance of the dark matter relic density, the Higgsino- and particularly Wino-like LSP scenarios become promising explanations of the $a_μ$ result.

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