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arXiv 1003.2595hep-ph
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通过希格斯门的轻标量WIMP和CoGeNT

A light scalar WIMP through the Higgs portal and CoGeNT

Sarah Andreas, Chiara Arina, Thomas Hambye, Fu-Sin Ling, Michel H. G. Tytgat

摘要:

如果暗物质(DM)仅仅是一个标量粒子与希格斯玻色子的相互作用占主导地位,它的湮灭截面--这是相关的遗迹丰度和间接检测--和它的自旋无关的散射截面对核的比率只取决于DM质量。这是一个有趣的结果,固定的质量和直接检测率,以适应DAMA实验观察到的年调制,一个得到的遗迹密度与其观测值完全一致。在这封简短的信中,我们更新了这一结果,并面对最近的CoGeNT数据的模型,试探性地解释过剩的事件在反冲能谱是由于DM。CoGeNT,作为DAMA,指向轻DM候选者,具有稍微不同的(但不一定不相容的)质量和截面。对于CoGeNT区域,我们发现标量DM遗物密度和直接检测约束之间的一个有趣的协议。我们给出了一个$σ$区域有利于CDMS-II事件,我们的排除限制的氙10(2009年)和氙100的数据,这取决于闪烁效率,可能会排除CoGeNT和DAMA。假设CoGeNT和/或DAMA是由于标量单重DM导致关于间接检测和碰撞器的明确预测。我们特别强调的限制模型,可能是由目前的{ \it费米}-LAT数据矮星系,并在大型强子对撞机的希格斯粒子的搜索的影响。

英文摘要:

If dark matter (DM) simply consists in a scalar particle interacting dominantly with the Higgs boson, the ratio of its annihilation cross section ---which is relevant both for the relic abundance and indirect detection--- and its spin-independent scattering cross section on nuclei depends only on the DM mass. It is an intriguing result that, fixing the mass and direct detection rate to fit the annual modulation observed by the DAMA experiment, one obtains a relic density in perfect agreement with its observed value. In this short letter we update this result and confront the model to the recent CoGeNT data, tentatively interpreting the excess of events in the recoil energy spectrum as being due to DM. CoGeNT, as DAMA, points toward a light DM candidate, with somewhat different (but not necessarily incompatible) masses and cross sections. For the CoGeNT region too, we find an intriguing agreement between the scalar DM relic density and direct detection constraints. We give the one $σ$ region favoured by the CDMS-II events, and our exclusion limits for the Xenon10 (2009) and Xenon100 data, which, depending on the scintillation efficiency, may exclude CoGeNT and DAMA. Assuming CoGeNT and/or DAMA to be due to scalar singlet DM leads to definite predictions regarding indirect detection and at colliders. We specifically emphasize the limit on the model that might be set by the current {\it Fermi}-LAT data on dwarf galaxies, and the implications for the search for the Higgs at the LHC.

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