论文标题
关于长寿命颗粒的起源
On the Origin of Long-Lived Particles
论文作者
论文摘要
Mathusla是一种提出的大容量位移顶点（DV）检测器，位于CM上方的表面，旨在寻找在HL-LHC处产生的长寿命颗粒（LLP）。我们表明，在Mathusla中发现LLP的发现不仅可以证明BSM物理学的存在，而且还将发现LLP的理论起源，尽管Mathusla没有收集有关LLP衰减产品的能量或动量信息。我们的分析简单又健壮，可以容易地包含更复杂的LLP方案，并且我们的方法适用于在Atlas，CMS，LHCB或其他外部探测器中发现的LLP衰减。如果发生LLP检测，Mathusla可以充当主要检测器的1级触发器，以确保在CMS上读出LLP生产事件。我们执行LLP简化的模型分析，以表明将Mathusla和CMS检测器的信息组合起来，可以允许LLP生产模式拓扑结合使用$ \ sim 100 $观察到的LLP衰减。基本理论参数（如LLP和父粒子质量）也可以通过$ \ lyssim 10 \％$精度来测量。以及从观察到的DV的几何特性中有关LLP衰减模式的信息，很明显，Mathusla和CMS将能够详细介绍任何新发现的物理学。
MATHUSLA is a proposed large-volume displaced vertex (DV) detector, situated on the surface above CMS and designed to search for long-lived particles (LLPs) produced at the HL-LHC. We show that a discovery of LLPs at MATHUSLA would not only prove the existence of BSM physics, it would also uncover the theoretical origin of the LLPs, despite the fact that MATHUSLA gathers no energy or momentum information on the LLP decay products. Our analysis is simple and robust, making it easily generalizable to include more complex LLP scenarios, and our methods are applicable to LLP decays discovered in ATLAS, CMS, LHCb, or other external detectors. In the event of an LLP detection, MATHUSLA can act as a Level-1 trigger for the main detector, guaranteeing that the LLP production event is read out at CMS. We perform an LLP simplified model analysis to show that combining information from the MATHUSLA and CMS detectors would allow the LLP production mode topology to be determined with as few as $\sim 100$ observed LLP decays. Underlying theory parameters, like the LLP and parent particle masses, can also be measured with $\lesssim 10\%$ precision. Together with information on the LLP decay mode from the geometric properties of the observed DV, it is clear that MATHUSLA and CMS together will be able to characterize any newly discovered physics in great detail.
