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arXiv 0705.2258hep-phastro-ph
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涌现超对称规范中介中的暗物质

Dark Matter in Gauge Mediation from Emergent Supersymmetry

Siew-Phang Ng, Nobuchika Okada

摘要:

从突现超对称性的观点出发,研究了中性伴子暗物质在规范介导下的生存性。在这个方案中,超对称性在普朗克尺度下破缺,因此引力子是超重的,完全脱离了低能理论。夸克和slepton获得他们的软质量主要通过规范调解与其他机制高度抑制。与传统的规范调解相反,最轻的超对称伙伴是中性伴子,它也是暗物质的候选者。通过对低能谱的显式计算,利用WMAP观测到的暗物质的残余密度、LEP 2 Higgs质量边界、超对称伙伴的对撞机边界和奇异B介子衰变约束了参数空间.我们发现,该模型具有有趣的混合功能,如近规范介导的频谱(例外是超重引力子),但与占主导地位的mSUGRA-like bino-stau共湮灭通道和大$\tan β$,A-共振般的湮灭。

英文摘要:

We investigated the viability of neutralino dark matter in the gauge mediation from emergent supersymmetry proposal. In this proposal, supersymmetry is broken at Planck scale and consequently, the gravitino is superheavy and completely decouples from the low energy theory. Squarks and sleptons obtain their soft masses dominantly through gauge mediation with other mechanisms highly suppressed. The lightest supersymmetric partner, in contrast to traditional gauge mediation, is a neutralino which is also a dark matter candidate. By explicit calculation of the low energy spectra, the parameter space was constrained using the WMAP observed relic density of dark matter, LEP2 Higgs mass bounds, collider bounds on supersymmetric partners and exotic B-meson decays. We found that the model has intriguing hybrid features such as a nearly gauge-mediated spectrum (the exception being the superheavy gravitino) but with a dominant mSUGRA-like bino-stau coannihilation channel and at large $\tan β$, A-resonance-like annihilation.

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