arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0911.1002astro-ph.COhep-ph
收藏

根据宇宙$e^{\pm}$和$\bar{p}$数据研究暗物质湮灭/衰变的中微子发射

Neutrino emission from dark matter annihilation/decay in light of cosmic $e^{\pm}$ and $\bar{p}$ data

Jie Liu, Qiang Yuan, Xiaojun Bi, Hong Li, Xinmin Zhang

摘要:

在我们的前期工作中,发展了一种基于马尔可夫链蒙特卡罗方法的自洽全局拟合方法,用于研究宇宙线正负电子过剩引起的暗物质(DM)性质。在这项工作中,我们进一步改进了以前的研究,包括强子分支比的DM湮灭/衰变。PAMELA $\bar{p}/p$数据被用来约束强子分支比。我们发现PAMELA $\bar{p}/p$数据所允许的夸克分支比的95%($2σ$)上限分别是DM湮灭的$\sim 0.032$和DM衰变的$\sim 0.044$。这一结果表明,DM耦合到纯轻子确实是目前的数据所青睐。在整体拟合结果的基础上,我们进一步研究了银河系中心DM的中微子发射。由于考虑了$γ$ -射线的约束,我们预测的中微子通量比以前的工作要小一些。然而,它仍然能够被即将到来的中微子探测器如IceCube探测到。与以往工作相比,本文的改进之处在于:1)采用全局拟合的方法导出了粒子物理和天体物理的DM参数; 2)包含了$γ$ -射线和反质子等多种数据的约束条件; 3)中微子发射的期望是完全自洽的。

英文摘要:

A self-consistent global fitting method based on the Markov Chain Monte Carlo technique to study the dark matter (DM) property associated with the cosmic ray electron/positron excesses was developed in our previous work. In this work we further improve the previous study to include the hadronic branching ratio of DM annihilation/decay. The PAMELA $\bar{p}/p$ data are employed to constrain the hadronic branching ratio. We find that the 95% ($2σ$) upper limits of the quark branching ratio allowed by the PAMELA $\bar{p}/p$ data is $\sim 0.032$ for DM annihilation and $\sim 0.044$ for DM decay respectively. This result shows that the DM coupling to pure leptons is indeed favored by the current data. Based on the global fitting results, we further study the neutrino emission from DM in the Galactic center. Our predicted neutrino flux is some smaller than previous works since the constraint from $γ$-rays is involved. However, it is still capable to be detected by the forth-coming neutrino detector such as IceCube. The improved points of the present study compared with previous works include: 1) the DM parameters, both the particle physical ones and astrophysical ones, are derived in a global fitting way, 2) constraints from various species of data sets, including $γ$-rays and antiprotons are included, and 3) the expectation of neutrino emission is fully self-consistent.

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。

↑