arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1402.7369hep-ph
收藏

亲轻子暗物质与μ子反常磁矩

Leptophilic Dark Matter and the Anomalous Magnetic Moment of the Muon

Prateek Agrawal, Zackaria Chacko, Christopher B. Verhaaren

摘要:

我们考虑可重正化理论,使得暗物质从轻子的散射发生在树的水平,但从核的散射只发生在圈。在这个框架中,各种各样的暗物质候选者可以根据它们的自旋和它们与轻子的相互作用形式来分类。我们确定的异常磁矩的μ子,从这些相互作用所产生的修正。然后,我们考虑这些结果的一组简化模型的亲轻暗物质的影响。当一个暗物质候选者减少了标准模型预测的异常磁矩和实验测量之间的现有张力时,有利于完全消除差异的参数空间区域被突出显示。相反,当一致性恶化时,我们对相应简化模型的参数进行限制。这些边界和有利的区域进行比较,对实验的限制,从直接检测和碰撞机搜索的简化模型。虽然这些限制是严重的,我们发现,在这些简单的理论,可以解释所观察到的μ子磁矩的异常,同时保持与所有的实验界限一致的参数空间存在有限的区域。

英文摘要:

We consider renormalizable theories such that the scattering of dark matter off leptons arises at tree level, but scattering off nuclei only arises at loop. In this framework, the various dark matter candidates can be classified by their spins and by the forms of their interactions with leptons. We determine the corrections to the anomalous magnetic moment of the muon that arise from these interactions. We then consider the implications of these results for a set of simplified models of leptophilic dark matter. When a dark matter candidate reduces the existing tension between the standard model prediction of the anomalous magnetic moment and the experimental measurement, the region of parameter space favored to completely remove the discrepancy is highlighted. Conversely, when agreement is worsened, we place limits on the parameters of the corresponding simplified model. These bounds and favored regions are compared against the experimental constraints on the simplified model from direct detection and from collider searches. Although these constraints are severe, we find there do exist limited regions of parameter space in these simple theories that can explain the observed anomaly in the muon magnetic moment while remaining consistent with all experimental bounds.

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。

↑