Azimuthal asymmetry in cosmic-ray boosted dark matter flux
Azimuthal asymmetry in cosmic-ray boosted dark matter flux
复制标题
宇宙射线增强暗物质通量中的方位不对称
作者：
C. Xia;Yan;Yu
由高能宇宙射线（称为CRDM）向上散射的光晕暗物质（DM）粒子可以是高能的，并且可以在传统的DM和中微子实验中检测到。我们发现，CRDM通量具有新颖的和可检测的形态特征。与大多数最近提出的助推DM（BDM）模型预测的银河系中心周围的方位对称DM流量，CRDM流量打破了方位对称性显着。利用宇宙射线电子在整个银河系的分布和优化的搜索区域在天空中根据CRDM流量的形态，我们得到了迄今为止最严格的约束DM电子散射截面的Super-Kamiokande（SK）IV数据，这提高了以前的约束SK-IV全天数据超过一个数量级。基于改进后的约束条件，我们预测在未来的Hyper-Kamiokande实验中可以在$sim3sigma $水平上观察到方位破缺效应。
Light halo dark matter (DM) particles up-scattered by high-energy cosmic rays (referred to as CRDM) can be energetic and become detectable at conventional DM and neutrino experiments. We show that the CRDM flux has a novel and detectable morphological feature. Unlike most of the recently proposed boosted DM (BDM) models which predict azimuthally symmetric DM fluxes around the Galactic Center, the CRDM flux breaks the azimuthal symmetry significantly. Using cosmic-ray electron distribution in the whole Galaxy and optimized search region in the sky according to the morphology of the CRDM flux, we derive so far the most stringent constraints on the DM-electron scattering cross section from the Super-Kamiokande (SK) IV data, which improves the previous constraints from the SK-IV full-sky data by more than an order of magnitude. Based on the improved constraints, we predict that the azimuthal symmetry-breaking effect can be observed in the future Hyper-Kamiokande experiment at $sim 3sigma$ level.