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arXiv 2101.02166hep-phhep-ex
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惰性偶极模型中低质量区首阶以上暗物质的残余密度:2。共湮灭

Relic density of dark matter in the inert doublet model beyond leading order for the low mass region: 2. Co-annihilation

Shankha Banerjee, Fawzi Boudjema, Nabarun Chakrabarty, Hao Sun

摘要:

我们研究了惰性偶极子模型(IDM)中轻质量暗物质区域的遗迹密度,当主导过程是由于模型中最轻的中性标量之间的共湮灭。完整的单回路电弱修正计算在壳方案,并被发现是很好地近似为一个有效的截面表示的$Z$ -可观的。对次优势过程进行了电弱修正,该次优势过程由湮灭成壳层上$W$和离壳层$W$组成,该次优势过程被计算为湮灭成三体终态。后者揭示了一个重要的依赖于一个参数,该参数描述了自相互作用的新标量(仅在黑暗的部门),一个参数,这是不可访问的树级计算的标准模型(SM)-IDM相互作用。

英文摘要:

We examine the relic density of the light mass dark matter region in the inert doublet model (IDM) when the dominant process is due to co-annihilation between the lightest neutral scalars of the model. The full one-loop electroweak corrections are computed in an on-shell scheme and are found to be well approximated as an effective cross-section expressed in terms of $Z$-observables. The electroweak corrections to the subdominant process which consists of an annihilation into an on-shell $W$ and an off-shell $W$, that is calculated as a annihilation into a 3-body final state, is also performed. The latter reveals an important dependence on a parameter that describes the self-interaction of the new scalars (solely within the dark sector), a parameter which is not accessible in tree-level calculations of standard model (SM)-IDM interactions.

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