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反向直接探测：Cosmic Ray与光暗物质的散射

Reverse Direct Detection: Cosmic Ray Scattering With Light Dark Matter

Christopher V. Cappiello, Kenny C. Y. Ng, John F. Beacom

备注：
Main text: 11 pages, 5 figures Appendix: 2 pages, 2 figures. References updated and minor edits made to match version that appears in PRD
发表信息：
Phys. Rev. D 99, 063004 (2019)
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摘要：

亚GeV的暗物质候选者越来越受到人们的关注，因为像GeV尺度的WIMP这样长期受到青睐的候选者还没有被探测到。对于低质量的暗物质，与模型无关的约束很弱或不存在。我们表明，对于这样的候选人，因为数密度高，宇宙射线的传播可以受到弹性散射与暗物质。我们称这种类型的搜索为“反向直接探测”，因为暗物质是目标，而标准模型粒子是光束。利用一个简单的银河宇宙射线传播模型，我们计算了暗物质如何影响地球上的宇宙线光谱，并对暗物质-质子和暗物质-电子截面设置了新的限制。对于质子，我们的极限与宇宙学的限制是竞争性的，但是是独立的。对于电子，我们的极限涵盖了尚未探测到的质量，并将宇宙学约束提高了一到两个数量级。我们评论了未来的工作如何显着提高暗物质相互作用的宇宙射线探测器的灵敏度。

英文摘要：

Sub-GeV dark matter candidates are of increasing interest, because long-favored candidates such as GeV-scale WIMPs have not been detected. For low-mass dark matter, model-independent constraints are weak or nonexistent. We show that for such candidates, because the number density is high, cosmic ray propagation can be affected by elastic scattering with dark matter. We call this type of search `reverse direct detection,' because dark matter is the target and Standard Model particles are the beam. Using a simple propagation model for galactic cosmic rays, we calculate how dark matter affects cosmic ray spectra at Earth, and set new limits on the dark matter-proton and dark matter-electron cross sections. For protons, our limit is competitive with cosmological constraints, but is independent. For electrons, our limit covers masses not yet probed, and improves on cosmological constraints by one to two orders of magnitude. We comment on how future work can significantly improve the sensitivity of cosmic-ray probes of dark matter interactions.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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