论文标题
可见扇形长寿命颗粒的暗物质和男性生成
Dark Matter and Baryogenesis from Visible-Sector Long-Lived Particles
论文作者
论文摘要
我们提出了标准模型的最小扩展，其中包括一个长寿命的费米，带有弱规模的质量和$ {\ cal o}（{\ rm gev}）$ fermionic暗物质候选者，两者都耦合到夸克。在辐射主导的相中，TEV尺度彩色标量的衰变使前者具有热丰度，同时也产生了暗物质。然后，长寿的费米恩主导着宇宙的能量密度，并驱动了早期物质统治的时期。它衰减的是重新加热宇宙，主要是通过重击侵略性相互作用，这些相互作用也会产生重子不对称，而对暗物质的分支很小。我们找到了模型的允许参数空间，并表明可以通过提出的长寿命粒子搜索以及下一代中子抗抗原振荡实验对其进行探测。只要宇宙处于$ t \ gtrsim {\ cal o}（{\ rm tev}）$，该模型对暗物质和男性生成的强大解释。
We present a minimal extension of the standard model that includes a long-lived fermion with weak-scale mass and an ${\cal O}({\rm GeV})$ fermionic dark matter candidate both of which are coupled to quarks. Decays of a TeV-scale colored scalar in a radiation-dominated phase bring the former to a thermal abundance while also producing dark matter. The long-lived fermion then dominates the energy density of the Universe and drives a period of early matter domination. It decays to reheat the Universe, mainly through baryon-number-violating interactions that also generate a baryon asymmetry, with a small branching fraction to dark matter. We find the allowed parameter space of the model and show that it can be probed by proposed long-lived particle searches as well as next-generation neutron-antineutron oscillation experiments. This model provides a robust explanation of dark matter and baryogenesis as long as the Universe is in a radiation-dominated phase at $T \gtrsim {\cal O}({\rm TeV})$.
