arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1602.04788hep-phastro-ph.HE
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单重态-二重态费米子暗物质模型中银河系中心的$\textit{Fermi}$ - LAT gamma-ray过剩

The $\textit{Fermi}$-LAT gamma-ray excess at the Galactic Center in the singlet-doublet fermion dark matter model

Shunsaku Horiuchi, Oscar Macias, Diego Restrepo, Andres Rivera, Hamish Silverwood, Oscar Zapata

摘要:

单重态-二重态费米子暗物质模型(SDFDM)提供了一个很好的DM候选者,以及产生中微子质量的可能性辐射。DM的搜索和识别需要结合的努力,间接和直接DM检测实验,除了大型强子对撞机。值得注意的是,来自银河系中心(GCE)的过量GeV伽马射线已被\textit{Fermi}大口径望远镜(LAT)测量到,该望远镜对于弥漫银河系背景建模的变化似乎很稳健。虽然已经提出了几个天体物理学的解释,DM仍然是一个简单和动机良好的替代方案。在这项工作中,我们研究的灵敏度的暗物质搜索SDFDM的情况下,使用$\textit{Fermi}$ -LAT,CTA,IceCube/DeepCore,LUX,PICO和大型强子对撞机的参数空间,可以占GCE的探索区域的重点。我们发现,DM粒子存在于这个模型中的质量接近$\sim 99$ GeV和$\sim (173-190)$ GeV湮灭主要进入$W^+W^-$通道和$t\bar{t}$通道分别,提供了一个可接受的适合的GCE,同时与不同的电流实验边界一致。我们还发现,所获得的参数空间中的大部分可以排除由未来的直接搜索实验,如LZ和XENON-1 T,在这些检测器的空结果的情况下。有趣的是,我们发现LUX的最新数据开始探测SDFDM模型中的最佳拟合区域。

英文摘要:

The singlet-doublet fermion dark matter model (SDFDM) provides a good DM candidate as well as the possibility of generating neutrino masses radiatively. The search and identification of DM requires the combined effort of both indirect and direct DM detection experiments in addition to the LHC. Remarkably, an excess of GeV gamma rays from the Galactic Center (GCE) has been measured with the \textit{Fermi} Large Area Telescope (LAT) which appears to be robust with respect to changes in the diffuse galactic background modeling. Although several astrophysical explanations have been proposed, DM remains a simple and well motivated alternative. In this work, we examine the sensitivities of dark matter searches in the SDFDM scenario using $\textit{Fermi}$-LAT, CTA, IceCube/DeepCore, LUX, PICO and LHC with an emphasis on exploring the regions of the parameter space that can account for the GCE. We find that DM particles present in this model with masses close to $\sim 99$ GeV and $\sim (173-190)$ GeV annihilating predominantly into the $W^+W^-$ channel and $t\bar{t}$ channel respectively, provide an acceptable fit to the GCE while being consistent with different current experimental bounds. We also find that much of the obtained parameter space can be ruled out by future direct search experiments like LZ and XENON-1T, in case of null results by these detectors. Interestingly, we show that the most recent data by LUX is starting to probe the best fit region in the SDFDM model.

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