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arXiv 1103.5145astro-ph.COhep-exhep-ph
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WIMP天文学和粒子物理学，带液体惰性和低温直接探测实验

WIMP astronomy and particle physics with liquid-noble and cryogenic direct-detection experiments

Annika H. G. Peter

备注：
25 pages, 27 figures, matches published version
发表信息：
Phys. Rev D 83, 125029 (2011)
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摘要：

一旦弱相互作用大质量粒子（WIMP）在直接探测实验中被明确探测到，挑战将是确定人们可以从数据中推断出什么。在这里，我检查重建的WIMP粒子物理特性（质量，截面）从下一代低温和液体惰性直接检测实验的局部速度分布的前景。我发现，固定的速度分布的形式时，估计约束的WIMP质量和截面的常见方法意味着失去了包含在数据中的速度分布的信息，并可能导致偏差的粒子物理参数的推断值。我表明，使用一个更一般的，经验形式的速度分布，可以导致良好的约束速度分布。此外，可以使用贝叶斯模型选择标准来确定速度分布的理论启发的函数形式（例如麦克斯韦-玻尔兹曼分布）是否比经验模型更适合。WIMP质量和截面之间的简并度的形状及其与这些参数的真实值的偏移取决于速度分布的假设，这对直接检测和对撞机数据之间的一致性检查具有重要意义。此外，我发现理论参数的不确定性敏感地依赖于用于WIMP搜索的能量范围的上限。如果将WIMP搜索扩展到更高的能量（~ 1 MeV），则可以得到对WIMP粒子物理参数和速度分布的更好的约束。

英文摘要：

Once weakly-interacting massive particles (WIMPs) are unambiguously detected in direct-detection experiments, the challenge will be to determine what one may infer from the data. Here, I examine the prospects for reconstructing the local speed distribution of WIMPs in addition to WIMP particle-physics properties (mass, cross sections) from next-generation cryogenic and liquid-noble direct-detection experiments. I find that the common method of fixing the form of the velocity distribution when estimating constraints on WIMP mass and cross sections means losing out on the information on the speed distribution contained in the data and may lead to biases in the inferred values of the particle-physics parameters. I show that using a more general, empirical form of the speed distribution can lead to good constraints on the speed distribution. Moreover, one can use Bayesian model-selection criteria to determine if a theoretically-inspired functional form for the speed distribution (such as a Maxwell-Boltzmann distribution) fits better than an empirical model. The shape of the degeneracy between WIMP mass and cross sections and their offset from the true values of those parameters depends on the hypothesis for the speed distribution, which has significant implications for consistency checks between direct-detection and collider data. In addition, I find that the uncertainties on theoretical parameters depends sensitively on the upper end of the energy range used for WIMP searches. Better constraints on the WIMP particle-physics parameters and speed distribution are obtained if the WIMP search is extended to higher energy (~ 1 MeV).

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