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arXiv 2006.10035hep-phastro-ph.CO
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无异常暗物质ALP的XENON1T过剩及其对恒星冷却异常的意义

XENON1T excess from anomaly-free ALP dark matter and its implications for stellar cooling anomaly

Fuminobu Takahashi, Masaki Yamada, Wen Yin

摘要:

最近,在XENON 1 T实验收集的电子反冲数据中发现了异常过量。如果类轴子粒子(ALP)构成了局部暗物质(DM)的全部或部分,则可以用质量为几keV的类轴子粒子(ALP)和与电子的$g_{ae} \sim 10^{-13}$耦合来解释过量。为了满足X射线约束,ALP与光子的耦合必须比与电子的耦合显著抑制。这强烈表明ALP与光子没有异常耦合,即,无U(1)$_{\rm PQ}$ -U(1)$_{\rm em}$ -U(1)$_{\rm em}$异常。我们表明,这样的异常免费ALP DM预测的X射线线信号具有一定的强度,通过操作员所产生的阈值校正,并将其与预计灵敏度的ATHENA X射线天文台。ALP DM的丰度可以通过错位机制来解释,或者如果它构成DM的一部分,则可以通过热产生来解释。特别地,当ALP约占DM的10%时,XENON 1 T实验所报道的异常过剩现象以及来自白矮星和红巨星的恒星冷却异常现象可以得到更好的解释.作为具体模型,我们重新审视了[Phys.Lett.B 734(2014)178-182]中考虑的无亲轻子异常ALP DM以及补充材料中基于两个Higgs双重态模型的ALP模型。

英文摘要:

Recently, an anomalous excess was found in the electronic recoil data collected at the XENON1T experiment. The excess may be explained by an axion-like particle (ALP) with mass of a few keV and a coupling to electron of $g_{ae} \sim 10^{-13}$, if the ALP constitutes all or some fraction of local dark matter (DM). In order to satisfy the X-ray constraint, the ALP coupling to photons must be significantly suppressed compared to that to electrons. This strongly suggests that the ALP has no anomalous couplings to photons, i.e., there is no U(1)$_{\rm PQ}$-U(1)$_{\rm em}$-U(1)$_{\rm em}$ anomaly. We show that such anomaly-free ALP DM predicts an X-ray line signal with a definite strength through the operator arising from threshold corrections, and compare it with the projected sensitivity of the ATHENA X-ray observatory. The abundance of ALP DM can be explained by the misalignment mechanism, or by thermal production if it constitutes a part of DM. In particular, we find that the anomalous excess reported by the XENON1T experiment as well as the stellar cooling anomalies from white dwarfs and red giants can be explained simultaneously better when the ALP constitutes about 10\% of DM. As concrete models, we revisit the leptophilic anomaly-free ALP DM considered in [Phys.Lett.B 734 (2014) 178-182] as well as an ALP model based on a two Higgs doublet model in the supplemental material.

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