作为暗物质与cosmic ray电子相互作用探针的γ射线的圆极化
Circular polarisation of gamma rays as a probe of dark matter interactions with cosmic ray electrons
摘要：
传统的间接暗物质（DM）搜索寻找来自天空的电磁辐射中的过量，这些电磁辐射不能归因于已知的天体物理来源。在这里，我们认为，光子偏振是一个重要的功能，以了解新的物理相互作用，可以利用，以提高我们的敏感性DM。特别是，圆偏振可以从超越标准模型相互作用中产生，如果它们违反宇称，并且参与相互作用的粒子数量不对称。在这项工作中，我们考虑了一个简化的模型为费米子（马约拉纳）DM和研究的圆极化伽马射线低于10 GeV的宇宙射线电子的散射DM。我们计算了银河系中心正负极化光子的微分通量，表明圆偏振度可达90%。最后，一旦对撞机和DM的约束条件已被考虑在内，我们估计所需的灵敏度从未来的实验来检测这个信号发现，虽然一个独特的峰值将存在于光子通量谱，在不久的将来观察是不太可能的。然而，在这项工作中没有考虑的不同来源或模型可能提供更高强度的通量，导致可能被e-ASTROGAM探测到。在发现的情况下，我们认为，极化分数是一个有价值的表征功能的新部门。
英文摘要：
Conventional indirect dark matter (DM) searches look for an excess in the electromagnetic emission from the sky that cannot be attributed to known astrophysical sources. Here, we argue that the photon polarisation is an important feature to understand new physics interactions and can be exploited to improve our sensitivity to DM. In particular, circular polarisation can be generated from Beyond the Standard Model interactions if they violate parity and there is an asymmetry in the number of particles which participate in the interaction. In this work, we consider a simplified model for fermionic (Majorana) DM and study the circularly polarised gamma rays below 10 GeV from the scattering of cosmic ray electrons on DM. We calculate the differential flux of positive and negative polarised photons from the Galactic Center and show that the degree of circular polarization can reach up to 90%. Finally, once collider and DM constraints have been taken into account, we estimate the required sensitivity from future experiments to detect this signal finding that, although a distinctive peak will be present in the photon flux spectrum, a near future observation is unlikely. However, different sources or models not considered in this work could provide higher intensity fluxes, leading to a possible detection by e-ASTROGAM. In the event of a discovery, we argue that the polarisation fraction is a valuable characterisation feature of the new sector.
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