Study of dark matter and QCD-charged mediators in the quasidegenerate regime
Study of dark matter and QCD-charged mediators in the quasidegenerate regime
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准生成态暗物质和 QCD 带电介体的研究
DOI：
10.1103/physrevd.96.115029
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发表时间：
2017
影响因子：
5
通讯作者：
Stengel, Patrick
中科院分区：
文献类型：
--
作者：
Davidson, Andrew;Kelso, Chris;Kumar, Jason;Sandick, Pearl;Stengel, Patrick
我们研究了这样一种情况，在这种情况下，唯一的轻新粒子是马约拉纳费米子暗物质候选粒子和一个或多个带qcd电荷的标量，它们与轻夸克耦合。如果新粒子在质量上接近简并，这种情况有几个有趣的现象学特征。特别是，大型强子对撞机搜索光标量的灵敏度降低了，因为可见和不可见的产物往往更软。此外，暗物质-标量共湮灭可以使相对较重的暗物质候选物成为一致的热遗迹。最后，暗物质核子散射截面在准生成极限下得到增强，使得直接探测实验可以使用自旋无关和自旋相关的散射来探测超出LHC探测范围的参数空间区域。虽然这种情况有广泛的应用，但我们根据最小超对称标准模型来描述这项研究，在极限下，唯一的轻粒子是双象暗物质候选粒子和淡味夸克。
We study a scenario in which the only light new particles are a Majorana fermion dark matter candidate and one or more QCD-charged scalars, which couple to light quarks. This scenario has several interesting phenomenological features if the new particles are nearly degenerate in mass. In particular, LHC searches for the light scalars have reduced sensitivity, since the visible and invisible products tend to be softer. Moreover, dark matter-scalar coannihilation can allow even relatively heavy dark matter candidates to be consistent thermal relics. Finally, the dark matter nucleon scattering cross section is enhanced in the quasidegenerate limit, allowing direct detection experiments to use both spin-independent and spin-dependent scattering to probe regions of parameter space beyond those probed by the LHC. Although this scenario has a broad application, we phrase this study in terms of the minimal supersymmetric standard model, in the limit where the only light sparticles are a binolike dark matter candidate and light-flavored squarks.