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arXiv 1512.02472hep-ph
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NMSSM中中性伴子暗物质的盲点

Blind spots for neutralino dark matter in the NMSSM

Marcin Badziak, Marek Olechowski, Paweł Szczerbiak

摘要:

在NMSSM中研究了中性伴子暗物质与核的散射截面。几类盲点的直接检测单希格斯诺暗物质的分析确定,包括这样的,没有类似的MSSM。结果表明,混合的希格斯二重态与标量单重态的参数空间中的盲点的位置有很大的影响。特别是,这种混合允许在进入中性伴子质量矩阵的参数的符号分配中有更大的自由度,这是出现盲点所需的,与MSSM或具有去耦单线态的NMSSM相比。此外,盲点可能出现任何组成的单-希格斯诺LSP。特别注意的情况下,单重主导的标量轻于125 GeV的希格斯粒子的消失树级自旋无关散射截面可能会导致希格斯粒子和单重主导的标量交换之间的相消干涉。自旋无关散射截面与希格斯观测值的相关性也进行了讨论。

英文摘要:

Spin-independent cross-section for neutralino dark matter scattering off nuclei is investigated in the NMSSM. Several classes of blind spots for direct detection of singlino-Higgsino dark matter are analytically identified, including such that have no analog in the MSSM. It is shown that mixing of the Higgs doublets with the scalar singlet has a big impact on the position of blind spots in the parameter space. In particular, this mixing allows for more freedom in the sign assignment for the parameters entering the neutralino mass matrix, required for a blind spot to occur, as compared to the MSSM or the NMSSM with decoupled singlet. Moreover, blind spots may occur for any composition of a singlino-Higgsino LSP. Particular attention is paid to cases with the singlet-dominated scalar lighter than the 125 GeV Higgs for which a vanishing tree-level spin-independent scattering cross-section may result from destructive interference between the Higgs and the singlet-dominated scalar exchange. Correlations of the spin-independent scattering cross-section with the Higgs observables are also discussed.

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