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arXiv 2007.15563hep-ph
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中微子磁矩入口:宇宙学、天体物理学和直接探测

The Neutrino Magnetic Moment Portal: Cosmology, Astrophysics, and Direct Detection

Vedran Brdar, Admir Greljo, Joachim Kopp, Toby Opferkuch

摘要:

我们重新审视中微子磁矩的物理学,特别关注的情况下,右手的,或无菌,中微子比左手的标准模型中微子更重(高达几兆电子伏)。讨论的中心是在中微子或暗物质实验中检测由跃迁磁矩介导的上散射事件的想法。考虑到中微子从所有已知的来源,以及包括所有可用的数据从XENON1T和Borexino,我们得到最强的最新的排斥限制的活动到无菌中微子的过渡磁矩。然后,我们研究补充约束天体物理学和宇宙学,执行,特别是一个彻底的分析BBN。我们发现,这些数据集仔细检查了大部分相关的参数空间。解释过渡磁矩的XENON1 T过剩是勉强可能的,如果保守的假设,采用超新星1987 A和CMB的约束。最后,我们讨论了建模的挑战,出现在场景中,功能大磁矩,同时保持中微子质量远低于1电子伏特。我们提出了一个成功的紫外线完整的模型,这种类型的基础上TeV尺度的leptoquark,建立与μ子磁矩,B物理异常,并在大型强子对撞机的对撞机搜索的联系。

英文摘要:

We revisit the physics of neutrino magnetic moments, focusing in particular on the case where the right-handed, or sterile, neutrinos are heavier (up to several MeV) than the left-handed Standard Model neutrinos. The discussion is centered around the idea of detecting an upscattering event mediated by a transition magnetic moment in a neutrino or dark matter experiment. Considering neutrinos from all known sources, as well as including all available data from XENON1T and Borexino, we derive the strongest up-to-date exclusion limits on the active-to-sterile neutrino transition magnetic moment. We then study complementary constraints from astrophysics and cosmology, performing, in particular, a thorough analysis of BBN. We find that these data sets scrutinize most of the relevant parameter space. Explaining the XENON1T excess with transition magnetic moments is marginally possible if conservative assumptions are adopted regarding the supernova 1987A and CMB constraints. Finally, we discuss model-building challenges that arise in scenarios that feature large magnetic moments while keeping neutrino masses well below 1 eV. We present a successful ultraviolet-complete model of this type based on TeV-scale leptoquarks, establishing links with muon magnetic moment, B physics anomalies, and collider searches at the LHC.

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