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arXiv 1604.04559hep-phastro-ph.COhep-exphysics.atom-ph
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暗物质在电子上的散射：原子激发的精确计算和对DAMA信号的影响

Dark matter scattering on electrons: Accurate calculations of atomic excitations and implications for the DAMA signal

B. M. Roberts, V. A. Dzuba, V. V. Flambaum, M. Pospelov, Y. V. Stadnik

发表信息：
Phys. Rev. D 93, 115037 (2016)
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摘要：

我们重新审视了WIMP型暗物质对电子的散射，导致原子电离，并可以在各种现有的直接检测实验中表现出来。与WIMP-核子散射不同，目前的实验探测的典型相互作用强度远小于费米常数，电子上的散射需要更强的相互作用才能被检测到，这反过来又需要新的光力载流子。我们通过引入一个与暗物质和电子具有标量或矢量耦合的中介粒子，明确地解释了这种新的力。然后，我们进行国家的最先进的数值计算的原子电离相关的现有实验。我们的目标是始终如一地考虑问题的原子物理学方面（例如，相对论效应，这可能是相当重要的），并扫描参数空间：暗物质质量，介质质量，和有效耦合强度，看看是否有任何部分的参数空间，可以潜在地解释DAMA调制信号。虽然我们发现，调制分数的所有事件的能量沉积在2千电子伏以上的碘化钠可以是相当显着的，达到~ 50%，参数空间的相关部分被排除在XENON 10和XENON 100实验。

英文摘要：

We revisit the WIMP-type dark matter scattering on electrons that results in atomic ionization, and can manifest itself in a variety of existing direct-detection experiments. Unlike the WIMP-nucleon scattering, where current experiments probe typical interaction strengths much smaller than the Fermi constant, the scattering on electrons requires a much stronger interaction to be detectable, which in turn requires new light force carriers. We account for such new forces explicitly, by introducing a mediator particle with scalar or vector couplings to dark matter and to electrons. We then perform state of the art numerical calculations of atomic ionization relevant to the existing experiments. Our goals are to consistently take into account the atomic physics aspect of the problem (e.g., the relativistic effects, which can be quite significant), and to scan the parameter space: the dark matter mass, the mediator mass, and the effective coupling strength, to see if there is any part of the parameter space that could potentially explain the DAMA modulation signal. While we find that the modulation fraction of all events with energy deposition above 2 keV in NaI can be quite significant, reaching ~50%, the relevant parts of the parameter space are excluded by the XENON10 and XENON100 experiments.

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