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arXiv 1502.03342hep-phastro-ph.CO
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根据直接探测信号太阳中暗物质俘获率的与晕无关的下限

A halo-independent lower bound on the dark matter capture rate in the Sun from a direct detection signal

Mattias Blennow, Juan Herrero-Garcia, Thomas Schwetz

摘要:

我们表明,在一个暗物质(DM)的直接检测实验中的积极信号可以用来放置在太阳的DM捕获率的下限,独立的DM晕。对于一个给定的粒子物理模型和DM质量,我们得到了一个下限的捕获率独立的本地DM密度,速度分布,银河逃逸速度,以及散射截面。我们通过假设即将到来的直接检测实验将很快获得显著的信号来说明捕获率的下限。当比较捕获率的下限与中微子望远镜对太阳高能中微子通量的限制时,我们可以对导致中微子的DM湮灭通道的分支分数设置上限。根据目前冰立方和超级神冈的数据,可以得到自旋相关相互作用和直接湮灭为中微子的非平凡极限。在某些情况下,到$ττ$或$b\bar b$的湮灭也开始受到约束。对于自旋无关的相互作用,电流约束很弱,但它们可能会对未来中微子望远镜的数据感兴趣。

英文摘要:

We show that a positive signal in a dark matter (DM) direct detection experiment can be used to place a lower bound on the DM capture rate in the Sun, independent of the DM halo. For a given particle physics model and DM mass we obtain a lower bound on the capture rate independent of the local DM density, velocity distribution, galactic escape velocity, as well as the scattering cross section. We illustrate this lower bound on the capture rate by assuming that upcoming direct detection experiments will soon obtain a significant signal. When comparing the lower bound on the capture rate with limits on the high-energy neutrino flux from the Sun from neutrino telescopes, we can place upper limits on the branching fraction of DM annihilation channels leading to neutrinos. With current data from IceCube and Super-Kamiokande non-trivial limits can be obtained for spin-dependent interactions and direct annihilations into neutrinos. In some cases also annihilations into $ττ$ or $b\bar b$ start getting constrained. For spin-independent interactions current constraints are weak, but they may become interesting for data from future neutrino telescopes.

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