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arXiv 2103.09835hep-phhep-ex
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$B$物理异常和$t$通道暗物质的系统方法

Systematic approach to $B$-physics anomalies and $t$-channel dark matter

Giorgio Arcadi, Lorenzo Calibbi, Marco Fedele, Federico Mescia

摘要:

我们研究了具有最小场含量的可重正化模型,该模型可以通过标准冻结范式提供可行的暗物质候选者,同时,在一个循环中容纳半轻子$B$ -介子衰变中观察到的异常。在极小性假设下,这个结果可以通过扩展标准模型的粒子谱来实现,要么是一个矢量类费米子和两个标量,要么是两个矢量类费米子和一个标量。暗物质湮灭是由$B$-通道交换的其他新粒子促成的$B$ -异常,从而导致味道观测值和暗物质丰度之间的相关性。再次基于极小性,我们假设新的状态只与左手μ子和第二代和第三代夸克耦合。除了一个特殊的对称性需要稳定的暗物质,新的国家的相互作用只取决于规范不变性。本文首次根据标准模型规范群下新场的量子数,对这类可能的模型作了系统的分类。在这个一般的设置中,我们确定了一组代表性的模型,我们系统地研究,应用最新的约束从味观测,专用暗物质实验,和LHC搜索轻子和/或喷气机和丢失的能量,和消失的带电轨道。

英文摘要:

We study renormalisable models with minimal field content that can provide a viable Dark Matter candidate through the standard freeze-out paradigm and, simultaneously, accommodate the observed anomalies in semileptonic $B$-meson decays at one loop. Following the hypothesis of minimality, this outcome can be achieved by extending the particle spectrum of the Standard Model either with one vector-like fermion and two scalars or two vector-like fermions and one scalar. The Dark Matter annihilations are mediated by $t$-channel exchange of other new particles contributing to the $B$-anomalies, thus resulting in a correlation between flavour observables and Dark Matter abundance. Again based on minimality, we assume the new states to couple only with left-handed muons and second and third generation quarks. Besides an ad hoc symmetry needed to stabilise the Dark Matter, the interactions of the new states are dictated only by gauge invariance. We present here for the first time a systematic classification of the possible models of this kind, according to the quantum numbers of the new fields under the Standard Model gauge group. Within this general setup we identify a group of representative models that we systematically study, applying the most updated constraints from flavour observables, dedicated Dark Matter experiments, and LHC searches of leptons and/or jets and missing energy, and of disappearing charged tracks.

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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