用XMASS-I探测器寻找玻色子超弱相互作用大质量暗物质粒子
Search for bosonic superweakly interacting massive dark matter particles with the XMASS-I detector
摘要：
玻色子超弱相互作用大质量粒子（super-WIMPs）是暖暗物质的候选者。当氙原子吸收了这样的玻色子后，这些候选的暗物质将在探测器中储存相当于其静止质量的能量。这是第一个直接探测实验，探索40至120 keV质量范围内的矢量超级WIMP。使用165.9天的数据，在41 kg的基准质量中没有观察到显著超出背景的情况。目前对矢量超弱相互作用粒子的限制排除了这样的粒子构成所有暗物质的可能性。信号的缺失也提供了对赝标超WIMP与电子的耦合常数的最严格的直接约束。利用探测器中$10^{-4}$ kg $^{-1}$ keV $_{ee}^{-1}$ day $^{-1}$水平的低背景，实现了前所未有的灵敏度。
英文摘要：
Bosonic superweakly interacting massive particles (super-WIMPs) are a candidate for warm dark matter. With the absorption of such a boson by a xenon atom these dark matter candidates would deposit an energy equivalent to their rest mass in the detector. This is the first direct detection experiment exploring the vector super-WIMPs in the mass range between 40 and 120 keV. Using 165.9 days of data no significant excess above background was observed in the fiducial mass of 41 kg. The present limit for the vector super-WIMPs excludes the possibility that such particles constitute all of dark matter. The absence of a signal also provides the most stringent direct constraint on the coupling constant of pseudoscalar super-WIMPs to electrons. The unprecedented sensitivity was achieved exploiting the low background at a level $10^{-4}$ kg$^{-1}$keV$_{ee}^{-1}$day$^{-1}$ in the detector.
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