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Novel approach to assess the impact of the Fano factor on the sensitivity of low-mass dark matter experiments

机译:评估FANO因子对低质量暗物质实验敏感性影响的新方法

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摘要

As first suggested by U. Fano in the 1940s, the statistical fluctuation of the number of pairs produced in an ionizing interaction is known to be sub-Poissonian. The dispersion is reduced by the so-called “Fano factor,” which empirically encapsulates the correlations in the process of ionization. In modeling the energy response of an ionization measurement device, the effect of the Fano factor is commonly folded into the overall energy resolution. While such an approximate treatment is appropriate when a significant number of ionization pairs are expected to be produced, the Fano factor needs to be accounted for directly at the level of pair creation when only a few are expected. To do so, one needs a discrete probability distribution of the number of pairs created N with independent control of both the expectation μ and Fano factor F. Although no distribution P(N|μ, F) with this convenient form exists, we propose the use of the COM-Poisson distribution together with strategies for utilizing it to effectively fulfill this need. We then use this distribution to assess the impact that the Fano factor may have on the sensitivity of low-mass WIMP search experiments.
机译:如U. Fano在20世纪40年代所建议的那样,已知在电离相互作用中产生的对数的统计波动是子泊松。通过所谓的“Fano因子”减少了分散体,其经验封装了电离过程中的相关性。在建模电离测量装置的能量响应时,扇形因子的效果通常折叠成总能量分辨率。虽然这种近似处理是适当的,但是当预期大量的电离对时,扇形因子需要在只期望几个时直接占对成对的水平。为此,需要一种采用对期望μ和扇动因子F的独立控制而产生的对成对数的离散概率分布。尽管存在具有这种方便形式的分布P(n |μ,f),但我们提出了使用Com-Poisson分布以及利用它以有效地满足这种需求的策略。然后,我们使用此分布来评估Fano因子可能对低质量WIMP搜索实验的灵敏度的影响。

著录项

  • 来源
    《Physical review, D》 |2018年第1期|共9页
  • 作者单位

    Department of Physics Engineering Physics &

    Astronomy Queen's University Kingston Ontario K7L 3N6 Canada;

    Department of Physics Engineering Physics &

    Astronomy Queen's University Kingston Ontario K7L 3N6 Canada;

    Department of Physics Engineering Physics &

    Astronomy Queen's University Kingston Ontario K7L 3N6 Canada;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 粒子物理学;场论;
  • 关键词

    Novel approach; low-mass dark; matter experiments;

    机译:新方法;低质量暗;物质实验;

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