发表机构
Istituto Nazionale di Fisica Nucleare, Sezione di Torino; Departamento de Física Teórica, M-15, Universidad Autónoma de Madrid; Instituto de Física Teórica UAM-CSIC, Universidad Autónoma de Madrid（意大利国家核物理研究所都灵分部; 马德里自治大学理论物理系; 马德里自治大学-西班牙高等科学研究理事会理论物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
利用INTEGRAL/IBIS二十年硬X射线数据，联合分析光谱与形态，对亚GeV暗物质湮灭和衰变给出95%上限，约束比现有X射线限制提高两个数量级，并转化为对暗光子和标量-希格斯混合参数的约束。
AI 中文摘要
我们利用INTEGRAL/IBIS望远镜二十年的弥散硬X射线观测，对亚GeV暗物质（DM）的湮灭和衰变提出了新的约束。通过对IBIS数据集中包含的光谱和形态信息进行联合分析，我们同时拟合银河系纵向分布和能谱，利用它们互补的特征信号，将潜在的暗物质信号与占主导地位的天体物理背景区分开来。我们采用物理动机明确的背景模型，将银河宇宙射线电子的逆康普顿（IC）辐射与未分辨的吸积白矮星的热辐射相结合，并一致地包含由暗物质诱导的电子和正电子种群在银河系中传播所产生的次级IC辐射。我们保守地推导出在1 MeV至5 GeV质量范围内，$e^+e^-$、$\mu^+\mu^-$和$\pi^+\pi^-$末态的湮灭截面$\langle\sigma v\rangle$和衰变半衰期$\tau$的95%上限。我们的约束范围为：对于湮灭，$10^{-28}$ cm$^3$/s $\lesssim \langle\sigma v\rangle \lesssim 10^{-26}$ cm$^3$/s；对于衰变，在暗物质质量为几MeV时，$\tau \gtrsim 10^{25}$ s，在大部分质量范围内，比现有的X射线限制提高了多达两个数量级。我们将这些界限转化为对暗光子动力学混合参数$\epsilon$和标量-希格斯混合角$\sin\theta$的约束，并与现有的间接、直接和加速器限制进行比较，为轻门户暗物质的允许参数空间提供了全面的图景。
英文摘要
We present new constraints on sub-GeV dark matter (DM) annihilation and decay using twenty years of diffuse hard X-ray observations from the INTEGRAL/IBIS telescope. By performing a joint analysis of the spectral and morphological information contained in the IBIS dataset, we simultaneously fit Galactic longitudinal profiles and energy spectra, exploiting their complementary signatures to disentangle potential DM signals from the dominant astrophysical backgrounds. We use physically motivated background models combining inverse-Compton (IC) emission from Galactic cosmic-ray electrons with thermal emission from unresolved accreting white dwarfs, and consistently include the secondary IC emission generated by DM-induced electron and positron populations propagated through the Galaxy. We conservatively derive 95% upper limits on the annihilation cross section $\langleσv\rangle$ and decay half-life $τ$ for the $e^+e^-$, $μ^+μ^-$, and $π^+π^-$ final states across the mass range 1 MeV to 5 GeV. Our constraints are in the range $10^{-28}$ cm$^3$/s $\lesssim \langleσv\rangle \lesssim 10^{-26}$ cm$^3$/s for annihilation and $τ\gtrsim 10^{25}$ s for decay at DM masses of a few MeV, improving upon existing X-ray limits by up to two orders of magnitude over much of the mass range. Our bounds are translated into constraints on the kinetic mixing parameter $ε$ of a dark photon and the scalar-Higgs mixing angle $\sinθ$, and compared with existing indirect, direct and accelerator limits available, providing a comprehensive picture of the allowed parameter space for light portal DM.
Comments30 pages, 15 figures. Comments are welcome!
