降低DAMA暗物质搜索的阈值
Lowering the Threshold in the DAMA Dark Matter Search
摘要：
DAMA实验通过探测器内预期但罕见的相互作用来寻找弱相互作用大质量粒子（WIMP）暗物质，由于地球的轨道运动，相互作用速率将在全年进行调制。在超过10年的运行过程中，DAMA确实检测到了事件率高于2 keVee的检测器阈值的强烈调制。在关于暗物质晕和WIMP相互作用的标准假设下，这个信号与两种不同近似质量的WIMP的预期一致：~ 10 GeV和~ 70 GeV。我们研究如何降低阈值，允许最近升级的DAMA检测器，可能会揭示这种情况。我们发现，较低的阈值数据应该排除自旋无关耦合的两个质量范围之一（在最坏的情况下，不利于一个质量仍然超过2.6 $σ$），很可能，但不确定，做同样的自旋相关耦合。此外，数据可以指示在某些情况下相互作用主要是自旋无关的还是自旋相关的。我们的研究结果说明了调制搜索中低阈值的重要性。
英文摘要：
The DAMA experiment searches for Weakly Interacting Massive Particle (WIMP) dark matter via its expected but rare interactions within the detector, where the interaction rates will modulate throughout the year due to the orbital motion of the Earth. Over the course of more than 10 years of operation, DAMA has indeed detected a strong modulation in the event rate above the detector threshold of 2 keVee. Under standard assumptions regarding the dark matter halo and WIMP interactions, this signal is consistent with that expected of WIMPs of two different approximate masses: ~ 10 GeV and ~ 70 GeV. We examine how a lower threshold, allowed by recent upgrades to the DAMA detector, may shed light on this situation. We find that the lower threshold data should rule out one of the two mass ranges for spin-independent couplings (in the worst case, disfavoring one of the masses by still more than 2.6$σ$) and is likely, though not certain, to do the same for spin-dependent couplings. Furthermore, the data may indicate whether the interaction is predominantly spin-independent or spin-dependent in some cases. Our findings illustrate the importance of a low threshold in modulation searches.
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