Indirect detection of the partial p wave via the s wave in the annihilation cross section of dark matter
Indirect detection of the partial p wave via the s wave in the annihilation cross section of dark matter
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DOI：
10.1103/physrevd.99.083003
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发表时间：
2019-01
影响因子：
5
通讯作者：
Steven J. Clark;J. Dent;B. Dutta;L. Strigari
中科院分区：
文献类型：
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作者：
Steven J. Clark;J. Dent;B. Dutta;L. Strigari
对于许多暗物质模型，由于主要的湮灭通道是速度或螺旋度被抑制的，因此目前的实验很难探测到两体末态的湮灭截面。包含规范玻色子辐射的三体末态可以解除螺旋抑制，允许速度无关的横截面主导湮灭过程，并提供了一个途径来约束这些模型。在这里，我们研究的实验约束的暗物质，湮灭到两个轻子加上韧致辐射玻色子，$\bar{\ell}+\ell+\gamma/W/Z$。我们认为实验限制光子的最终状态从费米-LAT使用扩散光子数据和矮球状星系的数据，并比较从21厘米的测量隐含的约束。扩散光子线搜索一般是最强的整个质量制度。我们特别强调暗物质湮灭为两个中微子和一个光子的模型，并表明这些模型通过光子测量比通过现有的中微子边界受到更强的约束。
For many dark matter models, the annihilation cross section to two-body final states is difficult to probe with current experiments because the dominant annihilation channel is velocity or helicity suppressed. The inclusion of gauge boson radiation for three-body final states can lift the helicity suppression, allowing a velocity-independent cross section to dominate the annihilation process, and providing an avenue to constrain these models. Here we examine experimental constraints on dark matter that annihilates to two leptons plus a bremsstrahlung boson, $\bar{\ell}+\ell+\gamma/W/Z$. We consider experimental constraints on photon final states from Fermi-LAT using both diffuse photon data and data from dwarf spheroidal galaxies, and compare to the implied constraints from 21 cm measurements. Diffuse photon line searches are generally the strongest over the entire mass regime. We in particular highlight the model in which dark matter annihilates to two neutrinos and a photon, and show that these models are more strongly constrained through photon measurements than through existing neutrino bounds.