arXiv 1209.10972012-09hep-phastro-ph.HE

111和128 GeV生产线的简单配方

A Simple Recipe for the 111 and 128 GeV Lines

JiJi Fan, Matthew Reece

备注：: 5 pages, 3 figures; v2: slightly expanded discussion, to appear in Phys Rev D
DOI：: 10.1103/PhysRevD.88.035014

摘要：

最近的证据表明，在大约111和128 GeV的能量的伽马射线线已被发现在费米-LAT数据从星系的中心和无关的点源。关于暗物质粒子对湮灭为γ-γ和γ-Z的解释有很多，但这些解释通常需要几个新粒子的质量有非常大的耦合或神秘的巧合才能符合信号强度。我们提出了一个简单的新的解释，其中暗物质是一个多重态的一部分，所有的质量接近260 GeV的对称性的结果。两个暗物质粒子湮灭为多重态中的一对中性粒子，随后衰变为伽马伽马和伽马Z。例如，一个可能有一个三重态的赝南布-戈德斯通玻色子、带电π介子和一个中性π介子，其中带电π介子在新的U（1）对称性下被它们的电荷稳定，而稍微轻一点的中性π介子态衰变为γ γ和γ Z。这种模型的对称结构解释了所产生的光子具有线状形状和观测到的大通量所需的质量的近简并性。中性态的可调寿命允许这样的模型在直接检测或对撞机实验中看不见，这可以限制大多数其他解释。然而，中性π介子寿命的核合成约束固定了新多重态和标准模型之间的最小必要耦合。光谱被预测为不是一条线，而是一个盒子，宽度为几个GeV，小于但在费米-LAT分辨率的顺序。

英文摘要：

Recently evidence for gamma ray lines at energies of approximately 111 and 128 GeV has been found in Fermi-LAT data from the center of the galaxy and from unassociated point sources. Many explanations in terms of dark matter particle pairs annihilating to gamma gamma and gamma Z have been suggested, but these typically require very large couplings or mysterious coincidences in the masses of several new particles to fit the signal strength. We propose a simple novel explanation in which dark matter is part of a multiplet of new states which all have mass near 260 GeV as a result of symmetry. Two dark matter particles annihilate to a pair of neutral particles in this multiplet which subsequently decay to gamma gamma and gamma Z. For example, one may have a triplet of pseudo-Nambu-Goldstone bosons, charged pions and a neutral pion, where the charged pions are stabilized by their charge under a new U(1) symmetry and the slightly lighter neutral pion state decays to gamma gamma and gamma Z. The symmetry structure of such a model explains the near degeneracy in masses needed for the resulting photons to have a line-like shape and the large observed flux. The tunable lifetime of the neutral state allows such models to go unseen at direct detection or collider experiments that can constrain most other explanations. However, nucleosynthesis constraints on the neutral pion lifetime fix a minimum necessary coupling between the new multiplet and the Standard Model. The spectrum is predicted to be not a line but a box with a width of order a few GeV, smaller than but on the order of the Fermi-LAT resolution.

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