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arXiv 1111.1063hep-ph
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暗物质湮灭的单色中微子流

Flavoring Monochromatic Neutrino Flux from Dark Matter Annihilation

Yasaman Farzan

摘要:

众所周知,如果暗物质(DM)粒子从太阳内部的原子核散射的截面足够大,太阳可以捕获DM粒子。原则上,太阳内部DM对的湮灭可以导致中微子望远镜探测到相对较大的中微子通量。如果湮灭直接产生中微子对,地球上的中微子流将是单色的。在这种情况下,振荡概率中的振荡项导致检测到的事件的新的季节性变化,其对初始风味成分敏感。在本文中,我们提出了两个模型,预测这样一个可检测的单色中微子流量从DM湮灭。模型I,这是基于增强的II型跷跷板机制,预测由$(m_ν)_{αβ}$确定的单色通量的风味组合物。在模型II中,DM对首先湮灭为一对无菌中微子,这对无菌中微子振荡为活性中微子,其风味成分由活性-无菌中微子混合的风味结构决定。

英文摘要:

As is well-known, if the scattering cross section of the Dark Matter (DM) particles off the nuclei inside the Sun is large enough, the Sun can trap DM particles. In principle, the annihilation of DM pair inside the Sun can then lead to the detection of a relatively large flux of neutrinos in the neutrino telescopes. If the annihilation directly produces a neutrino pair, the flux of neutrinos on Earth will be monochromatic. In this case, the oscillatory terms in the oscillation probability lead to a novel seasonal variation of detected events which is sensitive to the initial flavor composition. In this paper, we propose two models that predict such a detectable monochromatic neutrino flux from the DM annihilation. Model I, which is based on augmenting the type II seesaw mechanism, predicts a flavor composition for the monochromatic flux determined by $(m_ν)_{αβ}$. In model II, the DM pair first annihilates to a pair of sterile neutrinos which oscillate into active neutrinos with a flavor composition determined by the flavor structure of the active-sterile neutrino mixing.

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