ILC上的μ子ID
Muon ID at the ILC
摘要：
本文描述了一种高效率、高π排斥的μ子重建和识别的新方法。由于ILC中的μ子通常是在喷流中产生的，对于许多感兴趣的物理通道[1]，一种有效的算法来处理喷流中粒子的识别和分离是很重要的。该方法的核心算法考虑了磁场的影响以及由于检测器中的电离而导致的带电粒子的能量损失。我们选择在美国采用的一种直线对撞机概念探测器的设置中进行分析。在b对产生喷流中，粒子的动量范围很广;然而，约80%的粒子的动量低于30 GeV[2]。我们的研究，专注于bbar-b喷流，之前仔细分析了2和50 GeV之间的单能量粒子。由于中能粒子是喷流的主要组成部分，许多粒子在到达μ子探测器之前在量热计和螺线管线圈中损失了部分能量，在μ子探测器中它们的能量可能低于2 GeV。为了解决这个问题，我们对计算出的轨迹进行了龙格库塔修正，以更好地处理这些低能量粒子。多重散射和其他随机过程，更重要的是在较低的能量，是由卡尔曼滤波器集成到重建算法。该算法提供了一个独特的和强大的分离介子介子。来自螺线管的5特斯拉磁场围绕强子量热计，并允许重建和精确的动量测量下降到几个GeV。
英文摘要：
This paper describes a new way to reconstruct and identify muons with high efficiency and high pion rejection. Since muons at the ILC are often produced with or in jets, for many of the physics channels of interest[1], an efficient algorithm to deal with the identification and separation of particles within jets is important. The algorithm at the core of the method accounts for the effects of the magnetic field and for the loss of energy by charged particles due to ionization in the detector. We have chosen to develop the analysis within the setup of one of the Linear Collider Concept Detectors adopted by the US. Within b-pair production jets, particles cover a wide range in momenta; however ~ 80% of the particles have a momentum below 30 GeV[2]. Our study, focused on bbar-b jets, is preceded by a careful analysis of single energy particles between 2 and 50 GeV. As medium energy particles are a substantial component of the jets, many of the particles lose part of their energy in the calorimeters and the solenoid coil before reaching the muon detector where they may have energy below 2 GeV. To deal with this problem we have implemented a Runge-Kutta correction of the calculated trajectory to better handle these lower energy particles. The multiple scattering and other stochastic processes, more important at lower energy, is addressed by a Kalman-filter integrated into the reconstruction algorithm. The algorithm provides a unique and powerful separation of muons from pions. The 5 Tesla magnetic field from a solenoid surrounds the hadron calorimeter and allows the reconstruction and precision momentum measurement down to a few GeV.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
