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arXiv 1202.0284hep-ph
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离壳末态中微子与暗物质的间接探测

Neutrinos from Off-Shell Final States and the Indirect Detection of Dark Matter

John Kearney, Aaron Pierce

摘要:

我们重新讨论了暗物质在WW和TT运动学阈值附近的太阳中微子湮灭。我们调查的潜在的重要性,湮灭WW* 在最小的暗物质模型中,其中一个马约拉纳单线态混合矢量状电弱二重态,但许多结果推广到其他模型的弱相互作用的暗物质。我们重新评估了这个模型的间接检测约束,发现一旦所有的湮灭通道都被适当地考虑在内,最严格的约束自旋相关散射的暗物质质量为60 GeV < mX < mt来自超级神冈实验的结果。此外,我们建立了独立于模型的声明,马约拉纳暗物质的热遗迹丰度和中微子信号都是由湮灭通过s通道Z玻色子被排除在70 GeV < mX < mW。在某些模型中,tt* 的湮灭可以影响间接探测,特别是通过与湮灭竞争来测量玻色子的最终状态,从而削弱中微子信号。然而,在极小模型中,这种最终状态在很大程度上可以忽略不计,只允许质量比顶夸克质量低几个GeV的暗物质逃避排除。

英文摘要:

We revisit the annihilation of dark matter to neutrinos in the Sun near the WW and tt kinematic thresholds. We investigate the potential importance of annihilation to WW* in a minimal dark matter model in which a Majorana singlet is mixed with a vector-like electroweak doublet, but many results generalize to other models of weakly-interacting dark matter. We re-evaluate the indirect detection constraints on this model and find that, once all annihilation channels are properly taken into account, the most stringent constraints on spin-dependent scattering for dark matter mass 60 GeV < mX < mt are derived from the results of the Super-Kamiokande experiment. Moreover, we establish the model-independent statement that Majorana dark matter whose thermal relic abundance and neutrino signals are both controlled by annihilation via an s-channel Z boson is excluded for 70 GeV < mX < mW. In some models, annihilation to tt* can affect indirect detection, notably by competing with annihilation to gauge boson final states and thereby weakening neutrino signals. However, in the minimal model, this final state is largely negligible, only allowing dark matter with mass a few GeV below the top quark mass to evade exclusion.

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