Cui Ming-Yang, Yuan Qiang, Tsai Yue-Lin Sming, Fan Yi-Zhong
Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China.
Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China.
Phys Rev Lett. 2017 May 12;118(19):191101. doi: 10.1103/PhysRevLett.118.191101. Epub 2017 May 9.
Using the latest AMS-02 cosmic-ray antiproton flux data, we search for a potential dark matter annihilation signal. The background parameters about the propagation, source injection, and solar modulation are not assumed a priori but based on the results inferred from the recent B/C ratio and proton data measurements instead. The possible dark matter signal is incorporated into the model self-consistently under a Bayesian framework. Compared with the astrophysical background-only hypothesis, we find that a dark matter signal is favored. The rest mass of the dark matter particles is ∼20-80 GeV, and the velocity-averaged hadronic annihilation cross section is about (0.2-5)×10^{-26} cm^{3} s^{-1}, in agreement with that needed to account for the Galactic center GeV excess and/or the weak GeV emission from dwarf spheroidal galaxies Reticulum 2 and Tucana III. Tight constraints on the dark matter annihilation models are also set in a wide mass region.
利用最新的AMS - 02宇宙射线反质子通量数据，我们搜索潜在的暗物质湮灭信号。关于传播、源注入和太阳调制的背景参数并非先验假设，而是基于近期硼/碳比和质子数据测量推断出的结果。在贝叶斯框架下，可能的暗物质信号被自洽地纳入模型。与仅天体物理背景的假设相比，我们发现暗物质信号更受青睐。暗物质粒子的静止质量约为20 - 80 GeV，速度平均强子湮灭截面约为(0.2 - 5)×10⁻²⁶ cm³ s⁻¹，这与解释银河系中心GeV过量和/或矮球状星系网罟座2和杜鹃座III的微弱GeV发射所需的结果一致。同时在很宽的质量区域内也对暗物质湮灭模型设置了严格限制。
