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arXiv 2007.04963hep-phastro-ph.COhep-ex
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非弹性暗物质的EFT方法用于氙电子反冲探测

EFT Approach of Inelastic Dark Matter for Xenon Electron Recoil Detection

Hong-Jian He, Yu-Chen Wang, Jiaming Zheng

摘要:

通过电子反冲测量暗物质(DM)信号为直接探测轻DM粒子提供了重要手段。最近XENON 1 T异常与电子反冲能量约$\,E_R^{}\!=\!(2-3)$ keV可以自然地解释DM非弹性散射注入能量的反冲电子,并给出了一个狭窄的峰值结构的反冲光谱。本文提出了一种有效场论(EFT)方法来处理氙电子反冲探测中的非弹性DM信号。对于较重的介体,我们用有效的接触算符表示了两个DM场$(X,\,X')$和两个轻子的DM-轻子相互作用。使用XENON 1 T数据,我们拟合电子反冲谱并将允许的标量DM质量分裂约束为$\,2.1\,\text{keV}\!<\!Δm\!<\!3.3\,\text{keV}$(95% C.L.),具有最佳拟合的$\,Δm \!=\! 2.8$ keV。我们分析了这种有效的DM-电子接触相互作用产生的遗迹丰度。为了提供两个DM遗迹丰度和XENON 1 T过剩,我们得到新的DM质量和DM有效相互作用的UV截止尺度的限制。最后,我们研究了有效的DM轻子接触相互作用的可能的UV完成。

英文摘要:

Measuring dark matter (DM) signals via electron recoil provides an important means for direct detection of light DM particles. The recent XENON1T anomaly with electron recoil energy around $\,E_R^{}\!=\!(2-3)$keV can be naturally explained by DM inelastic scattering which injects energy to the recoiled electrons and gives a narrow peak structure in the recoil spectrum. We present an effective field theory (EFT) approach to exothermic inelastic DM signals for the Xenon electron recoil detection. For relatively heavy mediator, we fairly formulate the DM-lepton interactions by effective contact operators with two DM fields $(X,\,X')$ and two leptons. Using the XENON1T data, we fit the electron recoil spectrum and constrain the allowed scalar DM mass-splitting as $\,2.1\,\text{keV}\!<\!Δm\!<\!3.3\,\text{keV}$ (95%C.L.), with the best fit $\,Δm \!=\! 2.8$keV. We analyze the relic abundance produced by such effective DM-electron contact interaction. To provide both the DM relic abundance and the XENON1T excess, we derive new constraints on the DM mass and the UV cutoff scale of DM effective interactions. Finally, we study possible UV completions for the effective DM-lepton contact interactions.

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