arXiv 0908.17902009-08-13hep-phastro-ph.COhep-th

暗物质穿过中微子入口

Dark Matter Through the Neutrino Portal

Adam Falkowski, Jose Juknevich, Jessie Shelton

备注：: 37 pages, 9 figures

摘要：

我们考虑一个模型的暗物质，其最突出的签名是一个单色通量的TeV中微子从银河系中心。作为一般情况的一个例子，我们考虑一个特定的模型，其中的暗物质是一个费米子在伴随表示的隐藏SU（N）规范群，限制在GeV的能量。在暗区没有轻费米子态，这保证了暗物质在宇宙学时间尺度上的稳定性。暗物质通过中微子入口耦合到标准模型，即由希格斯和轻子双重态构造的单重态算符H L，它是标准模型中最低维的费米子单重态算符。这种耦合促使暗物质衰变，其中主导衰变通道在最终状态中具有一个中微子（和至少一个暗胶球）。其他带有带电标准模型粒子的衰变通道在最终状态中涉及更多的粒子，因此被相空间抑制。因此，相对于中微子信号，标准的间接探测信号如伽马射线光子、反质子和正电子被抑制。这种通过中微子入口的耦合受到超级神冈的强烈约束，它将暗物质的寿命限制在10 ^25秒以上。在不久的将来，新一代中微子望远镜将探测这种情况。ANTARES将对10^26秒量级的暗物质寿命敏感，而IceCube/DeepCore可以探测10^27秒的寿命。

英文摘要：

We consider a model of dark matter whose most prominent signature is a monochromatic flux of TeV neutrinos from the galactic center. As an example of a general scenario, we consider a specific model where the dark matter is a fermion in the adjoint representation of a hidden SU(N) gauge group that confines at GeV energies. The absence of light fermionic states in the dark sector ensures stability of dark matter on cosmological time scales. Dark matter couples to the standard model via the neutrino portal, that is, the singlet operator H L constructed from the Higgs and lepton doublets, which is the lowest dimensional fermionic singlet operator in the standard model. This coupling prompts dark matter decay where the dominant decay channel has one neutrino (and at least one dark glueball) in the final state. Other decay channels with charged standard model particles involve more particles in the final state and are therefore suppressed by phase space. In consequence, the standard indirect detection signals like gamma-ray photons, antiprotons and positrons are suppressed with respect to the neutrino signal. This coupling via the neutrino portal is most robustly constrained by Super-Kamiokande, which restricts the dark matter lifetime to be larger than 10^25 seconds. In the near future, the scenario will be probed by the new generation of neutrino telescopes. ANTARES will be sensitive to a dark matter lifetime of order 10^26 seconds, while IceCube/DeepCore can probe a lifetime as large as 10^27 seconds.

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