Loop corrections to dark matter direct detection in a pseudoscalar mediator dark matter model
Loop corrections to dark matter direct detection in a pseudoscalar mediator dark matter model
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DOI：
10.1007/jhep02(2019)028
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发表时间：
2019-02
影响因子：
5.4
通讯作者：
T. Abe;Motoko Fujiwara;J. Hisano
中科院分区：
文献类型：
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作者：
T. Abe;Motoko Fujiwara;J. Hisano
如果暗物质（DM）是费米子，并且它与标准模型粒子的相互作用是由赝标粒子介导的，那么在非相对论极限下，DM-核子弹性散射的树能级振幅被动量转移所抑制.另一方面，在环路水平，自旋无关的贡献的横截面出现没有这样的抑制。因此，回路校正对于讨论直接检测实验对模型预测的灵敏度是必不可少的。在以前的工作中，单回路校正进行了研究。然而，双环图给出了DM-胶子有效算符的首阶贡献，并且还没有得到正确的评价。此外，忽略了一些影响散射截面的相互作用项。本文给出了用改进的分析方法得到的截面，并讨论了截面变大的区域。
If dark matter (DM) is a fermion and its interactions with the standard model particles are mediated by pseudoscalar particles, the tree-level amplitude for the DM-nucleon elastic scattering is suppressed by the momentum transfer in the non-relativistic limit. At the loop level, on the other hand, the spin-independent contribution to the cross section appears without such suppression. Thus, the loop corrections are essential to discuss the sensitivities of the direct detection experiments for the model prediction. The one-loop corrections were investigated in the previous works. However, the two-loop diagrams give the leading order contribution to the DM-gluon effective operatorand have not been correctly evaluated yet. Moreover, some interaction terms which affect the scattering cross section were overlooked. In this paper, we show the cross section obtained by the improved analysis and discuss the region where the cross section becomes large.