利用DarkSide-50实验寻找低质量暗物质
Low-Mass Dark Matter Search with the DarkSide-50 Experiment
摘要:
我们给出了用低放射性氩靶寻找质量在20 GeV/c^2以下的暗物质WIMP的结果。数据是在Gran Sasso(LNGS)的Nazionali del Gran Sasso(LNGS)使用DarkSide-50装置获得的。该分析基于电离信号,对于该电离信号,DarkSide-50时间投影室在0.1 keVee下是完全有效的。在0.5 keVee的检测器中观察到的速率约为1.5事件/keVee/kg/天,几乎完全由已知的背景源解释。我们获得了90%的C. L。对于核子上暗物质的自旋无关截面,排除极限高于1.8 GeV/c^2,将暗物质的排除区域扩展到低于先前在1.8-6 GeV/c^2范围内的极限。
英文摘要:
We present the results of a search for dark matter WIMPs in the mass range below 20 GeV/c^2 using a target of low-radioactivity argon. The data were obtained using the DarkSide-50 apparatus at Laboratori Nazionali del Gran Sasso (LNGS). The analysis is based on the ionization signal, for which the DarkSide-50 time projection chamber is fully efficient at 0.1 keVee. The observed rate in the detector at 0.5 keVee is about 1.5 events/keVee/kg/day and is almost entirely accounted for by known background sources. We obtain a 90% C.L. exclusion limit above 1.8 GeV/c^2 for the spin-independent cross section of dark matter WIMPs on nucleons, extending the exclusion region for dark matter below previous limits in the range 1.8-6 GeV/c^2.
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