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arXiv 1003.5283astro-ph.HEhep-exhep-ph
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暗物质直接探测实验中残留背景事件对Halo WIMP速度分布函数重建的影响

Effects of Residue Background Events in Direct Dark Matter Detection Experiments on the Reconstruction of the Velocity Distribution Function of Halo WIMPs

Chung-Lin Shan

摘要:

在我们早期的工作中,通过直接使用从暗物质探测实验中测量的反冲能来重建弱相互作用大质量粒子(WIMP)的时间平均一维速度分布函数(的矩),假设分析的数据集是无背景的,即,所有事件都是WIMP信号。在这篇文章中,作为一个更现实的研究,我们考虑了一小部分可能的残留物背景事件,通过所有的判别标准,然后与其他真正的WIMP引起的事件在我们的数据集中混合。我们的模拟结果表明,对于一维WIMP速度分布的重建,在O(500)个总事件的分析数据集中,残余背景事件的最大可接受分数为~10% -20%。对于一个质量为50 GeV的WIMP,具有可忽略的不确定性和20%的残余背景事件,重建的速度分布的偏差原则上为~7.5%,统计不确定性为~18%(无背景数据集为~19%)。

英文摘要:

In our earlier work on the development of a model-independent data analysis method for reconstructing the (moments of the) time-averaged one-dimensional velocity distribution function of Weakly Interacting Massive Particles (WIMPs) by using measured recoil energies from direct Dark Matter detection experiments directly, it was assumed that the analyzed data sets are background-free, i.e., all events are WIMP signals. In this article, as a more realistic study, we take into account a fraction of possible residue background events, which pass all discrimination criteria and then mix with other real WIMP-induced events in our data sets. Our simulations show that, for the reconstruction of the one-dimensional WIMP velocity distribution, the maximal acceptable fraction of residue background events in the analyzed data set(s) of O(500) total events is ~10% - 20%. For a WIMP mass of 50 GeV with a negligible uncertainty and 20% residue background events, the deviation of the reconstructed velocity distribution would in principle be ~7.5% with a statistical uncertainty of ~18% (~19% for a background-free data set).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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