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arXiv 1504.04604hep-phastro-ph.HE
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从第一个AMS-02反质子数据得到的DM湮灭截面的上限

Upper limits on DM annihilation cross sections from the first AMS-02 antiproton data

Hong-Bo Jin, Yue-Liang Wu, Yu-Feng Zhou

摘要:

AMS-02合作组首次测量的反质子与质子比与常规宇宙线秒数在$\sim 10-100$ GeV动能范围内的预期一致,在$\sim 300$ GeV以上的动能范围内,它可以转化为暗物质湮灭截面的严格上限。使用GALPROP代码,我们推导出在各种传播模型和DM配置文件的上限。我们表明,在“传统”的传播模型,对于$q\bar q$,$b\bar b$,和$WW$的最终状态,约束可以更严格的比来自最近的费米-LAT伽玛射线数据的矮球状卫星星系。利用典型的最小值,中位数和最大值模型从以前的全球拟合,我们表明,上限的变化是大约五个因素。讨论了DM对高能$\bar p/p$数据贡献的可能性。

英文摘要:

The first measurement on the antiproton to proton ratio made by the AMS-02 collaboration agrees with the expection from conventional cosmic-ray secondaries in the kinetic energy range $\sim 10-100$ GeV, which can be turned into stringent upper limits on the dark matter (DM) annihilation cross sections above $\sim 300$ GeV. Using the GALPROP code, we derive the upper limits in various propagation models and DM profiles. We show that in the "conventional" propagation model, for the $q\bar q$, $b\bar b$, and $WW$ final states, the constraints can be more stringent than that derived from the recent Ferm-LAT gamma-ray data on the dwarf spheroidal satellite galaxies. Making use of the typical minimal, median and maximal models obtained from a previous global fit, we show that the variation of the upper limits is around a factor of five. The possibility of DM contribution to the high energy $\bar p/p$ data is discussed.

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