Search for annual and diurnal rate modulations in the LUX experiment
Search for annual and diurnal rate modulations in the LUX experiment
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DOI：
10.1103/physrevd.98.062005
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发表时间：
2018-09-27
影响因子：
5
通讯作者：
Zhang, C.
中科院分区：
文献类型：
--
作者：
Akerib, D. S.;Alsum, S.;Zhang, C.
各种暗物质模型预测，由于地球在晕中的运动，在基于地球的实验中，暗物质相互作用速率会发生年度和昼夜调制。对这些特征的观测可以为暗物质相互作用的探测提供一般性的证据。本文报告了使用2013年至2016年期间获得的超过20个日历月的数据在LUX暗物质实验中搜索年度和周日速率调制。这项研究的重点是低能量下的电子反冲事件，其中预计会发生亲轻暗物质相互作用，并且DAMA实验已经观察到二十多年的强烈速率调制。通过使用LUX探测器的最里面的体积和开发强大的切割和校正，我们获得了2.3 +/- 0.2 cpd/keV（ee）/吨的稳定事件率，这是所有暗物质实验中最低的。没有统计学上显着的年度调制观察到的能量窗口高达26千电子伏（ee）。2和6千电子伏（ee）之间，这项分析表明，最敏感的年度调制搜索到目前为止，与DAMA/LIBRA的结果与9.2西格玛张力。我们还报告没有观察到超过0.2 cpd/keV（ee）/吨振幅之间的2和6 keV（ee）的昼夜调制。
Various dark matter models predict annual and diurnal modulations of dark matter interaction rates in Earth-based experiments as a result of the Earth's motion in the halo. Observation of such features can provide generic evidence for detection of dark matter interactions. This paper reports a search for both annual and diurnal rate modulations in the LUX dark matter experiment using over 20 calendar months of data acquired between 2013 and 2016. This search focuses on electron recoil events at low energies, where leptophilic dark matter interactions are expected to occur and where the DAMA experiment has observed a strong rate modulation for over two decades. By using the innermost volume of the LUX detector and developing robust cuts and corrections, we obtained a stable event rate of 2.3 +/- 0.2 cpd/keV(ee)/tonne, which is among the lowest in all dark matter experiments. No statistically significant annual modulation was observed in energy windows up to 26 keV(ee). Between 2 and 6 keV(ee), this analysis demonstrates the most sensitive annual modulation search up to date, with 9.2 sigma tension with the DAMA/LIBRA result. We also report no observation of diurnal modulations above 0.2 cpd/keV(ee)/tonne amplitude between 2 and 6 keV(ee).