Constraints on spin-dependent dark matter scattering with long-lived mediators from TeV observations of the Sun with HAWC
Constraints on spin-dependent dark matter scattering with long-lived mediators from TeV observations of the Sun with HAWC
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DOI：
10.1103/physrevd.98.123012
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发表时间：
2018-08
影响因子：
5
通讯作者：
A. Albert;R. Alfaro;C. Álvarez;R. Arceo;J. Arteaga-Velázquez;D. Avila Rojas;H. A. Ayala Solares
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作者：
A. Albert;R. Alfaro;C. Álvarez;R. Arceo;J. Arteaga-Velázquez;D. Avila Rojas;H. A. Ayala Solares
我们通过寻找来自日盘的伽马射线来分析太阳作为间接探测暗物质的来源。通过与太阳核的弹性相互作用捕获暗物质，然后湮灭为长寿命介体，可以产生可检测的伽马射线通量。我们搜索了高海拔水切伦科夫天文台三年的数据，发现没有检测到来自太阳的 TeV 伽马射线发射的统计显着性。利用这一点，我们假设不稳定介体具有良好的寿命，用质子约束暗物质的自旋相关弹性散射截面，使其质量高于 1 TeV。这些结果补充了从 Fermi-LAT 对太阳的观测中获得的约束，并共同涵盖了 4 GeV 到 $10^6$ GeV 之间的 WIMP 质量。介体衰变到伽马射线的横截面约束可以强至 $\sim10^{-45}$ cm$^{-2}$，这比当前针对 1 TeV 暗物质质量的直接探测实验强四个数量级以上。更高质量下的横截面约束甚至更好，比当前 100 TeV 暗物质质量的直接探测约束好近 7 个数量级。这种敏感性的展示鼓励根据这些强大的新约束详细开发理论模型。
We analyze the Sun as a source for the indirect detection of dark matter through a search for gamma rays from the solar disk. Capture of dark matter by elastic interactions with the solar nuclei followed by annihilation to long-lived mediators can produce a detectable gamma-ray flux. We search three years of data from the High Altitude Water Cherenkov Observatory and find no statistically significant detection of TeV gamma-ray emission from the Sun. Using this, we constrain the spin-dependent elastic scattering cross section of dark matter with protons for dark matter masses above 1 TeV, assuming an unstable mediator with a favorable lifetime. The results complement constraints obtained from Fermi-LAT observations of the Sun and together cover WIMP masses between 4 GeV and $10^6$ GeV. The cross section constraints for mediator decays to gamma rays can be as strong as $\sim10^{-45}$ cm$^{-2}$, which is more than four orders of magnitude stronger than current direct-detection experiments for 1 TeV dark matter mass. The cross-section constraints at higher masses are even better, nearly 7 orders of magnitude better than the current direct-detection constraints for 100 TeV dark matter mass. This demonstration of sensitivity encourages detailed development of theoretical models in light of these powerful new constraints.