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arXiv 2212.08142hep-ph
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带有暗轻子调味的味 $(g-2)_μ$

Flavoured $(g-2)_μ$ with Dark Lepton Seasoning

Harun Acaroğlu, Prateek Agrawal, Monika Blanke

AI总结:

本文提出了一个轻子味的复标量暗物质简化模型,通过引入新的味破坏耦合矩阵和费米子媒介,在满足对撞机、味实验及暗物质探测等综合约束下,成功解释了缪子(g-2)反常且无需精细调节轻子质量。

摘要:

作为暗物质(DM)问题和缪子 $(g-2)$ 反常的联合解释,我们提出了一个轻子味的复标量 DM 简化模型,该模型与标准模型(SM)的左旋和右旋轻子均存在耦合。这两种相互作用由同一个新的味破坏耦合矩阵 $λ$ 控制,但我们允许耦合强度存在相对缩放。SM 进一步被两个费米子表示所扩展,它们分别表现为 $SU(2)_L$ 双态和单态,并媒介这些相互作用。这些费米子还通过新的汤川耦合与 SM 希格斯双态耦合。为了研究该模型的现象学,我们首先分别研究了来自对撞机搜索、味实验、SM 精度测试、DM 遗迹密度以及直接和间接探测实验的约束。然后,我们通过要求所有上述约束同时被满足来进行联合分析。我们使用该联合分析的结果,并检查该模型是否能够在其可行参数空间内容纳 $(g-2)_μ$ 反常,而不引入精细调节的轻子质量。在我们考虑的所有基准场景中,我们发现可以达到 $Δa_μ^\ ext{exp}$ 的中心值,而不会对轻子质量产生过大的修正。因此我们得出结论,该模型是一个可行且有吸引力的轻子味 DM 模型,同时解决了 $(g-2)_μ$ 反常。

英文摘要:

As a joint explanation for the dark matter (DM) problem and the muon $(g-2)$ anomaly, we propose a simplified model of lepton-flavoured complex scalar DM with couplings to both the left- and right-handed leptons of the Standard Model (SM). Both interactions are governed by the same new flavour-violating coupling matrix $λ$, however we allow for a relative scaling of the coupling strength. The SM is further extended by two fermion representations, transforming as an $SU(2)_L$ doublet and singlet, respectively, and mediating these interactions. The fermions additionally couple to the SM Higgs doublet via a new Yukawa coupling. To study the model's phenomenology we first investigate constraints from collider searches, flavour experiments, precision tests of the SM, the DM relic density, and direct as well as indirect detection experiments individually. We then perform a combined analysis by demanding that all mentioned constraints are satisfied simultaneously. We use the results of this combined analysis and examine if the model is capable of accommodating the $(g-2)_μ$ anomaly within its viable parameter space without introducing fine-tuned lepton masses. For all benchmark scenarios we consider, we find that the central value of $Δa_μ^\text{exp}$ can be reached without generating too large corrections to the lepton masses. We hence conclude that this model qualifies as a viable and attractive lepton-flavoured DM model that at the same time solves the $(g-2)_μ$ anomaly.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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