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arXiv 0712.0053astro-phhep-exhep-ph
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WIMP直接探测的定向反冲率

Directional recoil rates for WIMP direct detection

Moqbil S. Alenazi, Paolo Gondolo

备注：
39 pages, 15 figures
发表信息：
Phys.Rev.D77:043532,2008
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摘要：

实验室直接探测暗物质弱相互作用大质量粒子（WIMPs）的新技术对撞击核的反冲方向很敏感。我们计算和比较的方向反冲率${dR}/{d\cosθ}$（其中$θ$是从一个参考方向在天空中测量的角度）的几个WIMP速度分布，包括标准的暗晕和各向异性模型，如Sikivie的晚落晕模型和椭圆形模型。由于某些探测器可能无法区分反冲轨道的开始和结束（缺乏首尾区分），我们引入了“折叠”定向反冲率${dR}/{d|\cosθ|}$，其中$|\cosθ|$不区分轨道的头部和尾部。我们计算的CS $_2$和CF $_4$曝光所需的信号从各向同性的背景噪声中区分，并发现，${dR}/{d|\cosθ|}$是有效的标准暗晕和一些，但不是所有的各向异性模型。

英文摘要：

New techniques for the laboratory direct detection of dark matter weakly interacting massive particles (WIMPs) are sensitive to the recoil direction of the struck nuclei. We compute and compare the directional recoil rates ${dR}/{d\cosθ}$ (where $θ$ is the angle measured from a reference direction in the sky) for several WIMP velocity distributions including the standard dark halo and anisotropic models such as Sikivie's late-infall halo model and logarithmic-ellipsoidal models. Since some detectors may be unable to distinguish the beginning of the recoil track from its end (lack of head-tail discrimination), we introduce a ``folded'' directional recoil rate ${dR}/{d|\cosθ|}$, where $|\cosθ|$ does not distinguish the head from the tail of the track. We compute the CS$_2$ and CF$_4$ exposures required to distinguish a signal from an isotropic background noise, and find that ${dR}/{d|\cosθ|}$ is effective for the standard dark halo and some but not all anisotropic models.

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