论文标题
揭开LHC的冻结暗物质的神秘面纱
Demystifying Freeze-In Dark Matter at the LHC
论文作者
论文摘要
冻结机制在早期宇宙中提供了强大的暗物质生产。由于其微弱的相互作用，冻结的暗物质在山相物中留下了信号，这些信号通常与长期生命的粒子腐烂有关，因此带来了流离失所的顶点（DV）。在本文中，我们开发了一种读取与LHC DV事件有关的粒子质谱的方法。我们证明，我们的方法在有限的统计数据，检测器分辨率和涂抹效果下整洁起作用。 DV在LHC处的签名可能来自高度抑制的相位或微弱的粒子衰减过程的耦合。通过测量无形的粒子质谱，可以区分这两种情况，从而在LHC的早期宇宙中提取主要的冻结过程的信息。
Freeze-in mechanism provides robust dark matter production in the early universe. Due to its feeble interactions, freeze-in dark matter leaves signals at colliders which are often involved with long lived particle decays and consequent displaced vertices (DV). In this paper, we develop a method to read off mass spectrum of particles being involved in the DV events at the LHC. We demonstrate that our method neatly works under a limited statistics, detector resolution and smearing effects. The signature of DV at the LHC can come from either highly suppressed phase-space or a feeble coupling of particle decay processes. By measuring invisible particle mass spectrum, one can discriminate these two cases and thus extract information of dominant freeze-in processes in the early universe at the LHC.
