论文标题
近还是探测器？优化在电子峰值山区壁中的长寿命颗粒搜索
Near or Far Detectors? Optimizing Long-Lived Particle Searches at Electron-Positron Colliders
论文作者
论文摘要
我们在250-GEV ILC上探索了长寿命颗粒的发现潜力。目的是研究主要检测器ILD上专用远探测器的可能收益。为了具体，我们对通过$ e^+e^ - \ toaγ$或$ e^+e^+e^ - \ tozγ\ to（aγ）γ$产生的sub-gev轴状颗粒$ a $进行研究，并腐烂成对的带电瘦素。在理想的零背景和完美检测效率的情况下，我们发现将远处放置在计划的地下腔中或地面上的大型立方体的远见可以最多适度地增强对长寿命伪量表的敏感性。另一方面，由于其出色的角度覆盖层和径向厚度，ILD本身是寻找长寿命的理想环境。对于具有几个picobarns的横截面产生的长寿命颗粒，ILD可以探测高达300美元的寿命，或最多可衰减长度，最多可达100 $ \，$ m，以250 $ \，$ fb $^{ - 1} $数据的数据。对于通过弱相互作用产生的轴突样颗粒，ILC比在Belle II中介绍中移位的顶点搜索的敏感性更高。我们的发现类似于其他提出的电子 - 词素实验，具有高角度覆盖范围，例如FCC-EE和CEPC。
We explore the discovery potential for long-lived particles at the 250-GeV ILC. The goal is to investigate possible gains of a dedicated far detector over the main detector ILD. For concreteness, we perform our study for sub-GeV axion-like particles $a$ produced via $e^+e^- \to a γ$ or $e^+e^- \to Z γ\to (aγ)γ$ and decaying into pairs of charged leptons. In the ideal case of zero background and perfect detection efficiency, we find that far detectors placed in the planned underground cavities or a large cuboid on the ground can enhance the sensitivity to long-lived pseudo-scalars at best moderately. On the other hand, the ILD itself is a perfect environment to search for long-lived particles, due to its excellent angular coverage and radial thickness. For long-lived particles produced with cross sections of a few picobarns, the ILD could probe lifetimes up to 300$\,$ns, or proper decay lengths up to 100$\,$m, in 250$\,$fb$^{-1}$ of data. For axion-like particles produced through weak interactions, the ILC can reach an even higher sensitivity than searches for displaced vertices in meson decays at Belle II. Our findings apply similarly to other proposed electron-positron experiments with a high angular coverage, such as the FCC-ee and CEPC.
