矮星系Segue 1的Fermi-LAT观测对最小超对称性的直接约束
Direct Constraints on Minimal Supersymmetry from Fermi-LAT Observations of the Dwarf Galaxy Segue 1
摘要：
矮星系Segue 1是间接探测暗物质最有希望的目标之一。在这里，我们研究什么限制9个月的费米-LAT伽玛射线观测Segue 1放置在约束最小超对称标准模型（CMSSM），最轻的中性伴子的暗物质粒子。我们使用嵌套采样来探索CMSSM参数空间，同时拟合其他相关的约束，从加速器边界，遗迹密度，电弱精密可观测量，异常磁矩的μ子和B-物理。我们包括光谱和空间适合费米观测，仪器响应及其相关的不确定性，详细的背景模型的全面治疗。我们还对5年的观测进行了外推，假设在那段时间内没有从Segue 1观测到信号。结果稍微不利于模型与低中性伴子质量和高湮灭截面。然而，实际上所有这些模型都已经受到现有实验或遗迹密度限制的不利影响。
英文摘要：
The dwarf galaxy Segue 1 is one of the most promising targets for the indirect detection of dark matter. Here we examine what constraints 9 months of Fermi-LAT gamma-ray observations of Segue 1 place upon the Constrained Minimal Supersymmetric Standard Model (CMSSM), with the lightest neutralino as the dark matter particle. We use nested sampling to explore the CMSSM parameter space, simultaneously fitting other relevant constraints from accelerator bounds, the relic density, electroweak precision observables, the anomalous magnetic moment of the muon and B-physics. We include spectral and spatial fits to the Fermi observations, a full treatment of the instrumental response and its related uncertainty, and detailed background models. We also perform an extrapolation to 5 years of observations, assuming no signal is observed from Segue 1 in that time. Results marginally disfavour models with low neutralino masses and high annihilation cross-sections. Virtually all of these models are however already disfavoured by existing experimental or relic density constraints.
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