Claude Jérôme, Godfrey Stephen
Department of Physics, Ottawa-Carleton Institute for Physics, Carleton University, Ottawa, K1S 5B6 Canada.
Eur Phys J C Part Fields. 2021;81(5):405. doi: 10.1140/epjc/s10052-021-09170-0. Epub 2021 May 10.
We explore regions of parameter space that give rise to suppressed direct detection cross sections in a simple model of scalar dark matter with a scalar portal that mixes with the standard model Higgs. We found that even this simple model allows considerable room in the parameter space that has not been excluded by direct detection limits. A number of effects leading to this result have been previously noted. Our main new result explores interference effects between different contributions to DM annihilation when the DM mass is larger than the scalar portal mass. New annihilation channels open up and the parameters of the model need to compensate to give the correct DM relic abundance, resulting in smaller direct detection cross sections. We find that even in a very simple model of DM there are still sizeable regions of parameter space that are not ruled out by experiment.
我们在一个具有与标准模型希格斯粒子混合的标量门户的标量暗物质简单模型中，探索导致直接探测截面被压低的参数空间区域。我们发现，即使是这个简单模型，在尚未被直接探测极限排除的参数空间中仍有相当大的余地。此前已注意到导致这一结果的一些效应。我们主要的新结果探讨了当暗物质质量大于标量门户质量时，不同暗物质湮灭贡献之间的干涉效应。新的湮灭通道打开，模型参数需要进行补偿以给出正确的暗物质遗迹丰度，从而导致直接探测截面变小。我们发现，即使在一个非常简单的暗物质模型中，仍然存在相当大的未被实验排除的参数空间区域。
