利用H.E.S.S.银心巡天搜寻暗物质湮灭产生的伽马射线谱线
Search for gamma-ray spectral lines from dark matter annihilation with the H.E.S.S. Inner Galaxy Survey
AI总结：
本研究利用H.E.S.S.银心巡天数据搜寻TeV暗物质湮灭的伽马射线谱线，未发现显著信号，给出了Wino等暗物质模型的最严格排除极限，首次探测热Higgsino暗物质。
AI中文摘要：
TeV量级粒子暗物质（DM）湮灭预计会产生伽马射线谱线特征，这是暗物质的关键信号。利用大气切伦科夫望远镜观测银心，是探测热 relic TeV粒子暗物质的独特手段，其探测范围远超直接探测和对撞机搜索的能力。本文报告利用银心巡天数据搜寻甚高能伽马射线中的谱线信号，该数据包含H.E.S.S.对银心内部几度区域的546小时观测。未探测到显著信号，随后利用二维对数似然比检验统计量，结合暗物质信号的谱形和空间特征，计算湮灭线截面⟨σv⟩_line的排除极限。假设银河系采用Einasto暗物质密度分布，本结果给出迄今为止最严格的限制：对于DM质量为1 TeV和10 TeV，对应的⟨σv⟩_line分别达到2.3×10⁻²⁸ cm³s⁻¹和2.4×10⁻²⁷ cm³s⁻¹。利用当前限制对被广泛研究的Wino、Higgsino和Quintuplet模型进行约束，首次针对银河系暗物质模型探测热Higgsino暗物质。
英文摘要：
Spectral gamma-ray line features are expected as key signatures from dark matter (DM) annihilations of TeV-scale particle DM. Observations of the Galactic Centre with atmospheric Cherenkov telescopes are unique to probe thermal-relic TeV particle DM, well beyond the reach of direct detection and collider searches. We report here on the search for line signals in very-high-energy gamma rays using data from the Inner Galaxy Survey, consisting of 546 hours of H.E.S.S. observations of the inner few degrees of the Galactic Centre. No significant signal is detected. We then compute the exclusion limits on the annihilation line cross section $\langle σv \rangle_{\rm line}$, with a two-dimensional log-likelihood ratio test statistics, exploiting spectral and spatial features of the DM signal. Assuming an Einasto DM density profile for the Milky Way, our results provide the most constraining limits so far, reaching $\langle σv \rangle_{\rm line} = 2.3$ $\times$ $10^{-28}$ and $2.4 \times$ $10^{-27}$ cm$^3$s$^{-1}$ for DM masses of 1 and 10 TeV, respectively. The present limits are used to constrain the widely searched Wino, Higgsino and Quintuplet models. For the first time, thermal Higgsino DM is probed for DM Milky Way models.
