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arXiv 1012.4007hep-phastro-ph.HE
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超对称双暗物质模型中的暗物质信号

Signals of dark matter in a supersymmetric two dark matter model

Hiroki Fukuoka, Daijiro Suematsu, Takashi Toma

摘要:

超对称辐射中微子质量模型通常有两种暗物质候选者。一个是通常最轻的中性粒子与奇R宇称,另一个是一个新的中性粒子,其稳定性是由一个离散的对称性,禁止树级中微子汤川耦合保证。如果它们的遗迹丰度是可比的,那么暗物质现象学可能与最小超对称标准模型(MSSM)有很大不同。我们在具有守恒R宇称和反常效应弱破缺的$Z_2$对称性的超对称辐射中微子质量模型中研究了这一问题。这个新的$Z_2$的奇宇称的第二个暗物质是亚稳态的,并衰变为中性伴子暗物质。与这种衰变相关的带电粒子和光子会导致偏离预期的宇宙射线背景。直接寻找中性伴暗物质也有望显示出与MSSM不同的特征,因为遗迹丰度不仅仅由中性伴暗物质组成。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。

英文摘要:

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 $Z_2$ symmetry weakly broken by the anomaly effect. The second dark matter with odd parity of this new $Z_2$ 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.

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