论文标题
笔实验中的低质量迷你时间投影室的光束粒子跟踪
Beam particle tracking with a low-mass mini time projection chamber in the PEN experiment
论文作者
论文摘要
国际钢笔合作旨在获得Pion Electronic Decay $π^+ \ to E^+ν_e（γ）$，aka $π_{e2} $的分支比率的相对精度为$ 5 \ times 10^{ - 4} $或更好。 Pen设备包括许多检测系统，所有这些设备都为Pen事件重建提供了重要信息。本文讨论了用于亲，MUON和正电子束颗粒跟踪的迷你时间投影室（MTPC）的设计，性能和蒙特卡洛模拟。我们还回顾了提取的轨迹坐标在分析中的使用，尤其是在构建对区分背景过程至关重要的观察值时，以及最大程度地构建目标的基准体积，在无需引入偏差的情况下，可以接受衰减事件的衰减事件顶点的衰减事件顶点。
The international PEN collaboration aims to obtain the branching ratio for the pion electronic decay $π^+ \to e^+ν_e(γ)$, aka $π_{e2}$, to a relative precision of $5\times 10^{-4}$ or better. The PEN apparatus comprises a number of detection systems, all contributing vital information to the PEN event reconstruction. This paper discusses the design, performance, and Monte Carlo simulation of the mini time projection chamber (mTPC) used for pion, muon, and positron beam particle tracking. We also review the use of the extracted trajectory coordinates in the analysis, in particular in constructing observables critical for discriminating background processes, and in maximizing the fiducial volume of the target in which decay event vertices can be accepted for branching ratio extraction without introducing bias.
