Effects of residue background events in direct dark matter detection experiments on the reconstruction of the velocity distribution function of halo WIMPs
Effects of residue background events in direct dark matter detection experiments on the reconstruction of the velocity distribution function of halo WIMPs
复制标题
直接暗物质探测实验中残余背景事件对晕WIMP速度分布函数重建的影响
DOI:
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发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Chung
中科院分区:
文献类型:
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作者:
Chung
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 ?(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).
影响因子:
3.5
作者:
Lang R
通讯作者:
Lang R