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arXiv 2302.00644hep-ph
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类轴子暗物质介体

Axion-like Dark Matter Mediators

Sophie Mutzel

摘要:

在过去的几十年中,实验的进展显着限制了通过热冻结产生的标准电弱尺度WIMP,导致远离这个标准范式的转变。在这里,我们探讨了类轴子粒子(ALP)的可能性,近似U(1)的全球对称性的伪戈德斯通玻色子在高尺度$f_a$自发破缺,作为标准模型(SM)粒子和暗物质(DM)粒子之间的调解人。我们专注于的情况下,耦合太小,以允许DM生成通过冻结和DM是热解耦的SM粒子。然而,替代机制,如冻结和冻结从一个解耦的黑暗部门仍然可以重现所观察到的DM遗迹密度。在确定了这些方案的参数空间区域后,我们重新审视了来自电子束流实验、天体物理学和罕见的B和K衰变对ALP的实验约束。

英文摘要:

During the last decades, experimental advances have significantly constrained the standard electroweak-scale WIMP produced via thermal freeze-out, leading to a shift away from this standard paradigm. Here we explore the possibility of an axion-like particle (ALP), the pseudo-Goldstone boson of an approximate U(1) global symmetry spontaneously broken at a high scale $f_a$, acting as a mediator between the Standard Model (SM) particles and the dark matter (DM) particles. We focus on the case where the couplings are too small to allow for DM generation via freeze-out and the DM is thermally decoupled from the SM particles. However, alternative mechanisms like freeze-in and freeze-out from a decoupled dark sector can still reproduce the observed DM relic density. Having determined the region of parameter space for these scenarios, we then revisit experimental constraints on ALPs from electron beam dump experiments, astrophysics and rare B and K decays.

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