(In)direct detection of boosted dark matter
(In)direct detection of boosted dark matter
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DOI：
10.1088/1475-7516/2014/10/062
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发表时间：
2014-10-01
影响因子：
6.4
通讯作者：
Thaler, Jesse
中科院分区：
文献类型：
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作者：
Agashe, Kaustubh;Cui, Yanou;Thaler, Jesse
我们开始研究新的热暗物质（DM）场景，其中当前银河系中心的DM湮灭在黑暗区域产生增强的稳定粒子。这些稳定粒子是典型的亚显性DM成分，但由于它们在这一过程中产生了很大的洛伦兹boost，因此它们可以在大量的地面实验中通过与电子或原子核的中性电流相互作用来检测到。因此，这种新型的DM信号结合了与间接探测实验（即银河系DM湮灭）相关的产生机制和与直接探测实验（即DM从地面目标散射）相关的探测机制。这种过程通常存在于多组分DM场景或具有非最小DM稳定对称性的场景中。为了证明这一概念，我们提出了一个双组分热遗迹DM模型，其中优势的重DM物种与标准模型没有树级相互作用，从而在很大程度上避开了直接和间接DM界限。相反，它的热遗迹丰度是由湮灭成亚优势的较轻的DM物种决定的，后者可以通过今天发生的相同湮灭过程在增强通道中检测到。特别是对于10 MeV-10 GeV范围内的暗区质量，最有希望的信号是指向银河系中心的电子散射事件。这些可以在为中微子物理或质子衰变设计的实验中检测到，特别是Super-K及其升级版Hyper-K，以及冰立方的PINGU/MICA扩展。这种增强的DM现象突出了可能来自非最小暗扇区的独特特征。
We initiate the study of novel thermal dark matter (DM) scenarios where present-day annihilation of DM in the galactic center produces boosted stable particles in the dark sector. These stable particles are typically a subdominant DM component, but because they are produced with a large Lorentz boost in this process, they can be detected in large volume terrestrial experiments via neutral-current-like interactions with electrons or nuclei. This novel DM signal thus combines the production mechanism associated with indirect detection experiments (i.e. galactic DM annihilation) with the detection mechanism associated with direct detection experiments (i.e. DM scattering off terrestrial targets). Such processes are generically present in multi-component DM scenarios or those with non-minimal DM stabilization symmetries. As a proof of concept, we present a model of two-component thermal relic DM, where the dominant heavy DM species has no tree-level interactions with the standard model and thus largely evades direct and indirect DM bounds. Instead, its thermal relic abundance is set by annihilation into a subdominant lighter DM species, and the latter can be detected in the boosted channel via the same annihilation process occurring today. Especially for dark sector masses in the 10 MeV-10 GeV range, the most promising signals are electron scattering events pointing toward the galactic center. These can be detected in experiments designed for neutrino physics or proton decay, in particular Super-K and its upgrade Hyper-K, as well as the PINGU/MICA extensions of IceCube. This boosted DM phenomenon highlights the distinctive signatures possible from non-minimal dark sectors.