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arXiv 0709.3898hep-phastro-ph
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用完全三味蒙特卡罗方法研究WIMP湮没产生的中微子

Neutrinos from WIMP Annihilations Obtained Using a Full Three-Flavor Monte Carlo Approach

Mattias Blennow, Joakim Edsjo, Tommy Ohlsson

摘要:

弱相互作用大质量粒子(WIMPs)是宇宙中暗物质的主要候选者之一。如果这些粒子构成了暗物质,那么它们可以被太阳或地球捕获,沉入各自的核心,湮灭并产生中微子。因此,在朝向太阳和/或地球的中微子望远镜中,这些中微子可能是一个引人注目的暗物质特征。本文从几个方面改进了以往关于计算WIMP湮灭中微子产额的分析。我们包括中微子振荡在一个完整的三味框架,以及所有的影响,从中微子相互作用的方式通过太阳(吸收,能量损失,再生从τ衰变)。此外,我们还研究了混合角$θ_{13}$的非零值以及正常和倒置中微子质量等级的影响。我们的研究是在一个基于事件的设置,这使得这些结果非常有用的理论分析和建设中微子望远镜蒙特卡罗代码。我们所有的中微子产额的结果,以及我们的蒙特卡罗代码,是公开的。我们发现,μ子型中微子的产额从在太阳的WIMP湮灭增强或抑制,取决于占主导地位的WIMP湮灭通道。这种效应是由于中微子振荡引起的有效的味道混合。对于地球内部的WIMP湮灭,从源到探测器的距离太小,不允许中微子望远镜相关的中微子能量的任何显着振荡。

英文摘要:

Weakly Interacting Massive Particles (WIMPs) are one of the main candidates for the dark matter in the Universe. If these particles make up the dark matter, then they can be captured by the Sun or the Earth, sink to the respective cores, annihilate, and produce neutrinos. Thus, these neutrinos can be a striking dark matter signature at neutrino telescopes looking towards the Sun and/or the Earth. Here, we improve previous analyses on computing the neutrino yields from WIMP annihilations in several respects. We include neutrino oscillations in a full three-flavor framework as well as all effects from neutrino interactions on the way through the Sun (absorption, energy loss, and regeneration from tau decays). In addition, we study the effects of non-zero values of the mixing angle $θ_{13}$ as well as the normal and inverted neutrino mass hierarchies. Our study is performed in an event-based setting which makes these results very useful both for theoretical analyses and for building a neutrino telescope Monte Carlo code. All our results for the neutrino yields, as well as our Monte Carlo code, are publicly available. We find that the yield of muon-type neutrinos from WIMP annihilations in the Sun is enhanced or suppressed, depending on the dominant WIMP annihilation channel. This effect is due to an effective flavor mixing caused by neutrino oscillations. For WIMP annihilations inside the Earth, the distance from source to detector is too small to allow for any significant amount of oscillations at the neutrino energies relevant for neutrino telescopes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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