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arXiv 1306.1790hep-phastro-ph.COastro-ph.HE
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重新审视XENON100的约束（和信号？）对于低质量暗物质

Revisiting XENON100's Constraints (and Signals?) For Low-Mass Dark Matter

Dan Hooper

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11 pages, 6 figures
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摘要：

虽然CoGeNT和CDMS实验的观测结果被解释为低质量（~7-10 GeV）暗物质粒子的可能信号，但XENON 100合作的限制似乎与这一假设不相容，至少在表面上是这样。在本文中，我们重新审视氙100的约束暗物质在这个质量范围内，并考虑如何各种不确定性和假设可能会改变这一结论。我们还注意到，虽然XENON 100的两个核反冲候选者都表现出非常低的电离闪烁信号比率，使其难以归因于已知的电子或中子背景，但它们与CoGeNT和CDMS所青睐的质量范围内的暗物质粒子的起源是一致的。我们认为，较低的，但并非难以置信的，值的相对闪烁效率的液体氙（L_eff），并在氙100的电场（S_nr）的液体氙的闪烁信号的抑制，这两个事件可以始终引起暗物质粒子的质量和截面的范围内的CoGeNT和CDMS青睐。如果这种解释是正确的，我们预测，LUX实验，具有显着更高的光产额比氙100，应该观察到暗物质诱导的事件在可观察的速度约3-24个月。

英文摘要：

Although observations made with the CoGeNT and CDMS experiments have been interpreted as possible signals of low-mass (~7-10 GeV) dark matter particles, constraints from the XENON100 collaboration appear to be incompatible with this hypothesis, at least at face value. In this paper, we revisit XENON100's constraint on dark matter in this mass range, and consider how various uncertainties and assumptions made might alter this conclusion. We also note that while XENON100's two nuclear recoil candidates each exhibit very low ratios of ionization-to-scintillation signals, making them difficult to attribute to known electronic or neutron backgrounds, they are consistent with originating from dark matter particles in the mass range favored by CoGeNT and CDMS. We argue that with lower, but not implausible, values for the relative scintillation efficiency of liquid xenon (L_eff), and the suppression of the scintillation signal in liquid xenon at XENON100's electric field (S_nr), these two events could consistently arise from dark matter particles with a mass and cross section in the range favored by CoGeNT and CDMS. If this interpretation is correct, we predict that the LUX experiment, with a significantly higher light yield than XENON100, should observe dark matter induced events at an observable rate of ~3-24 per month.

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