论文标题
混合KSVZ轴上框架中的顶级暗物质
Top-philic Dark Matter in a Hybrid KSVZ axion framework
论文作者
论文摘要
我们在扩展的Kim-Shifman-Vainshtein-Zakharov（KSVZ）轴心框架中探索了两个组成的暗物质方案。这种混合设置结合了一个额外的$ su（2）_l $复杂的单线标量，其最轻的组件扮演着暗物质之一的作用，而KSVZ模型的QCD轴是作为第二个暗物质候选者。在这项工作中，我们专注于强调类似向量的夸克的作用，这些夸克在ksvz扩展中自然出现在暗物质和对撞机现象学上。在这里，我们证明了这种彩色粒子的存在可以通过打开额外的共同宣传以及直接检测通道来显着影响标量暗物质的允许的暗物质参数空间。此外，颜色粒子与顶部夸克和标量暗物质之间的相互作用提供了独特的拓扑结构，以产生一个增强的顶对，在LHC处具有相当大的横向动量。使用JET子结构变量和多元分析，在这里我们表明，人们已经可以将广泛的参数空间排除，其中139 $ \ text {fb}^{ - 1} $在14 TEV LHC处的集成光度。
We explore a two-component dark matter scenario in an extended Kim-Shifman-Vainshtein-Zakharov (KSVZ) axion framework. This hybrid setup incorporates an extra $SU(2)_L$ complex singlet scalar whose lightest component plays the role of one of the dark matter, while the QCD axion of the KSVZ model acts as a second dark matter candidate. In this work, we focus on accentuating the role of vector-like quark that naturally emerges in the KSVZ extension on the dark matter and collider phenomenology. Here, we demonstrate that the presence of this colored particle can significantly affect the allowed dark matter parameter space of the scalar dark matter by opening up additional co-annihilation as well as the direct detection channels. Moreover, the interaction between the color particle with the top quark and scalar dark matter provides a unique topology to generate a boosted-top pair with considerable missing transverse momentum at the LHC. Using jet substructure variables and multivariate analysis, here we show that one can already exclude a vast region of parameter space with 139 $\text{fb}^{-1}$ integrated luminosity at 14 TeV LHC.
