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arXiv 0811.0387hep-ph
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sUED中的统一暗物质模型

A Unified Dark Matter Model in sUED

Yang Bai, Zhenyu Han

摘要:

我们提出了一个暗物质模型,并将其扩展为标准模型单重态扩展的普适额外维模型(sUED),用来解释ATIC、PPB-BETS、PAMELA和DAMA的近期观测结果。除了在5维空间中传播的标准模型场外,还引入了一个费米子场和一个标量场,它们都是标准模型单态。新费米子的零模被确定为右手中微子,而它的第一个KK模是最轻的KK奇粒子和暗物质的候选者。ATIC和PPB-BETS的宇宙射线谱确定了暗物质粒子质量,因此第五维致密化尺度为1.0-1.6 TeV。质量低于1 GeV的单重标量场的零模提供了暗物质粒子之间的吸引力,这使得索末菲增强提高了星系晕中的湮灭截面,以解释PAMELA数据。DAMA年度调制的结果解释耦合相同的标量场的电子通过一个更高的维度运营商。分析了满足暗物质遗迹丰度要求并能容纳所有暗物质探测实验的模型参数空间。我们还考虑了来自弥漫的河外伽玛射线背景的约束,如果暗物质粒子和标量场的第一KK模式具有高度简并的质量,则可以满足该约束。

英文摘要:

We propose a dark matter model with standard model singlet extension of the universal extra dimension model (sUED) to explain the recent observations of ATIC, PPB-BETS, PAMELA and DAMA. Other than the standard model fields propagating in the bulk of a 5-dimensional space, one fermion field and one scalar field are introduced and both are standard model singlets. The zero mode of the new fermion is identified as the right-handed neutrino, while its first KK mode is the lightest KK-odd particle and the dark matter candidate. The cosmic ray spectra from ATIC and PPB-BETS determine the dark matter particle mass and hence the fifth dimension compactification scale to be 1.0-1.6 TeV. The zero mode of the singlet scalar field with a mass below 1 GeV provides an attractive force between dark matter particles, which allows a Sommerfeld enhancement to boost the annihilation cross section in the Galactic halo to explain the PAMELA data. The DAMA annual modulation results are explained by coupling the same scalar field to the electron via a higher-dimensional operator. We analyze the model parameter space that can satisfy the dark matter relic abundance and accommodate all the dark matter detection experiments. We also consider constraints from the diffuse extragalactic gamma-ray background, which can be satisfied if the dark matter particle and the first KK-mode of the scalar field have highly degenerate masses.

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。

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