Signals of dark matter in a supersymmetric two dark matter model
Signals of dark matter in a supersymmetric two dark matter model
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DOI：
10.1088/1475-7516/2011/07/001
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发表时间：
2010-12
影响因子：
6.4
通讯作者：
Hiroki Fukuoka;D. Suematsu;Takashi Toma
中科院分区：
文献类型：
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作者：
Hiroki Fukuoka;D. Suematsu;Takashi Toma
超对称辐射中微子质量模型通常有两个候选暗物质。一种是通常最轻的具有奇R宇称的中性微子，另一种是一种新的中性粒子，其稳定性由离散对称保证，这种对称禁止三级中微子与汤川耦合。如果它们的遗迹丰度相当，暗物质现象学可能与最小超对称标准模型(MSSM)有很大不同。我们在一个超对称辐射中微子质量模型中研究了这一点，该模型具有守恒的R宇称和被反常效应弱破坏的Z2对称性。这个新的Z2的奇数宇称的第二个暗物质是亚稳的，衰变为中性微诺暗物质。与这种衰变相关的带电粒子和光子可能会导致宇宙射线偏离预期的背景。对中性诺暗物质的直接搜索也有望显示出与MSSM不同的特征，因为遗迹丰度不仅仅是由中性诺暗物质组成的。通过对这些信号的定量分析，我们讨论了该模型中暗物质的性质。
Supersymmetric radiative neutrino mass models have often two dark matter candidates. One is the usual lightest neutralino with odd R parity and the other is a new neutral particle whose stability is guaranteed by a discrete symmetry that forbids tree-level neutrino Yukawa couplings. If their relic abundance is comparable, dark matter phenomenology can be largely different from the minimal supersymmetric standard model (MSSM). We study this in a supersymmetric radiative neutrino mass model with the conserved R parity and a Z2 symmetry weakly broken by the anomaly effect. The second dark matter with odd parity of this new Z2 is metastable and decays to the neutralino dark matter. Charged particles and photons associated to this decay can cause the deviation from the expected background of the cosmic rays. Direct search of the neutralino dark matter is also expected to show different features from the MSSM since the relic abundance is not composed of the neutralino dark matter only. We discuss the nature of dark matter in this model by analyzing these signals quantitatively.