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arXiv 0912.4264hep-phastro-ph.CO
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在CDMS-II结果之后直接暗物质搜索的全球解释

Global interpretation of direct Dark Matter searches after CDMS-II results

Joachim Kopp, Thomas Schwetz, Jure Zupan

摘要:

我们执行一个全球性的适合数据从暗物质(DM)的直接检测实验,包括最近的CDMS-II的结果。我们讨论了可能的解释DAMA年度调制信号的自旋独立和自旋相关的DM核相互作用,无论是弹性和非弹性散射。我们发现,在自旋相关的非弹性散射质子得到一个很好的拟合所有的数据。我们提出了一个简单的玩具模型实现这样的场景。在所有其余的情况下,DAMA允许的区域不受其他实验的青睐,或遭受严重的微调DM参数相对于银河系逃逸速度。最后,我们还考虑的可能性,在CDMS-II中观察到的两个事件是一个实际的信号的弹性DM散射,我们比较由此产生的CDMS-II允许的区域从其他实验的排除限制。在这份arXiv版本的手稿中,我们还在附录A中提供了更新的拟合,包括最近的CoGeNT结果。

英文摘要:

We perform a global fit to data from Dark Matter (DM) direct detection experiments, including the recent CDMS-II results. We discuss possible interpretations of the DAMA annual modulation signal in terms of spin-independent and spin-dependent DM-nucleus interactions, both for elastic and inelastic scattering. We find that in the spin-dependent inelastic scattering off protons a good fit to all data is obtained. We present a simple toy model realizing such a scenario. In all the remaining cases the DAMA allowed regions are disfavored by other experiments or suffer from severe fine tuning of DM parameters with respect to the galactic escape velocity. Finally, we also entertain the possibility that the two events observed in CDMS-II are an actual signal of elastic DM scattering, and we compare the resulting CDMS-II allowed regions to the exclusion limits from other experiments. In this arXiv version of the manuscript we also provide in appendix A the updated fits including recent CoGeNT results.

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