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arXiv 2112.08992hep-phastro-ph.CO
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具有TeV标度标量轻子的μ介子g-2的最小暗物质模型

A Minimal Dark Matter Model for Muon g-2 with Scalar Lepton Partners up to the TeV Scale

Jan Tristram Acuña, Patrick Stengel, Piero Ullio

摘要:

费米国家实验室(Fermi National Laboratory)的E989实验报告,测量到的μ子磁偶极矩与标准模型(SM)的预测值之间存在4.2 $σ$的差异。在这项研究中,我们解决的异常,考虑一个最小的和通用的扩展SM也提供了一个暗物质(DM)的候选人。这个框架中的额外状态是:SM单线态马约拉纳费米子,称为比诺,扮演DM的角色;和μ介子标量,称为slepton。如果标量μ子伙伴(或称之为顺子)混合了手征性,那么slepton、SM μ子和Bino之间的耦合可以解释μ子$g-2$异常。另一方面,DM遗迹密度主要通过涉及Bino和较轻的slepton的共湮灭效应来满足。我们的模型的可行的参数空间包括相对轻的共零化粒子的区域,类似于在最小超对称标准模型(MSSM)以前的扫描中发现的。放松的假设,最小的味道违反通常假设在MSSM,我们看到的情况下,具有相当大的smuon混合和大的质量分裂之间的smuon可以满足μ子$g-2$异常和DM遗迹密度coannihilating粒子质量达到和超过TeV的规模。当我们指定的起源的左右smuon混合的smuon和SM希格斯玻色子之间的三线性耦合,这些方案所产生的微扰么正性和电弱真空稳定性的限制,限制coannihilating粒子的质量为$\lesssim$ 1 TeV。我们表明,下一代直接检测实验是唯一的边缘敏感的可行的参数空间,我们的模型,因此,未来的轻子对撞机可能是必要的探针,以区分我们的模型从其他BSM解决方案的μ子$g-2$异常。

英文摘要:

The E989 experiment at the Fermi National Laboratory reported a 4.2$σ$ discrepancy between the measured magnetic dipole moment of the muon, and its prediction in the Standard Model (SM). In this study, we address the anomaly by considering a minimal and generic extension to the SM which also provides for a dark matter (DM) candidate. The extra states in this framework are: a SM singlet Majorana fermion, referred to as the Bino, playing the role of DM; and muonic scalars, referred to as sleptons. The couplings between the sleptons, SM muons and the Bino can account for the muon $g-2$ anomaly if the scalar muon partners, or smuons, mix chirality. On the other hand, the DM relic density is satisfied primarily through coannihilation effects involving the Bino and the lighter sleptons. The viable parameter space of our model includes regions with relatively light coannihilating particles, similar to what has been found in previous scans of the Minimal Supersymmetric Standard Model (MSSM). Relaxing the assumption of minimal flavor violation typically assumed in the MSSM, we see that scenarios with sizable smuon mixing and large mass splittings between the smuons can satisfy both the muon $g-2$ anomaly and the DM relic density for coannihilating particle masses up to and beyond the TeV scale. When we specify the origin of the left-right smuon mixing to be trilinear couplings between the smuons and the SM Higgs boson, the constraints on these scenarios arising from perturbative unitarity and electroweak vacuum stability confine the coannihilating particle masses to be $\lesssim$ 1 TeV. We demonstrate that next generation direct detection experiments are only marginally sensitive to the viable parameter space of our model and, thus, a future lepton collider could be the essential probe necessary to distinguish our model from other BSM solutions to the muon $g-2$ anomaly.

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