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arXiv 1404.1968physics.ins-detphysics.data-an
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硅条探测器调谐概率分布径迹拟合的改进

Improvements of Track Fitting with Well Tuned Probability Distributions for Silicon Strip Detectors

Gregorio Landi, Giovanni E. Landi

摘要:

本文以综合的方式说明了一个良好调谐的概率分布的构造,这些概率分布忠实地反映了硅条探测器中粒子的落点分布。它们用于轨道拟合显示出相对于标准方法的因子2(对于低噪声情况)和因子3(对于高噪声情况)的急剧改进。即使在存在具有大误差的命中的情况下,轨道也被很好地重建,具有令人惊讶的命中丢弃效果。所示的应用程序是PAMELA跟踪器的模拟,但其他类型的跟踪器可以类似地处理。计算的概率分布的重心算法,他们是非常不同的高斯概率。这些差异对于准确重建具有高错误命中的轨迹以及有效丢弃噪音太大的命中(异常值)至关重要。我们的分布与柯西分布的相似性迫使我们放弃标准差进行比较,而是使用半峰全宽。必须为这些应用开发一套数学方法,其中一些方法即使非常复杂,也是广义上的标准方法。一个是必不可少的,如果没有它,所有其他的都是无用的。因此,在本文中,我们报告了这种关键方法的细节。它提取探测器的物理特性,并允许插入的概率分布中的影响点的功能依赖。其他文件将专门讨论其余部分。

英文摘要:

The construction of a well tuned probability distributions is illustrated in synthetic way, these probability distributions produce faithful realizations of the impact point distributions for particles in silicon strip detector. Their use for track fitting shows a drastic improvements of a factor two, for the low noise case, and a factor three, for the high noise case, respect to the standard approach. The tracks are well reconstructed even in presence of hits with large errors, with a surprising effect of hit discarding. The applications illustrated are simulations of the PAMELA tracker, but other type of trackers can be handled similarly. The probability distributions are calculated for the center of gravity algorithms, and they are very different from gaussian probabilities. These differences are crucial to accurately reconstruct tracks with high error hits and to produce the effective discarding of the too noisy hits (outliers). The similarity of our distributions with the Cauchy distribution forced us to abandon the standard deviation for our comparisons and instead use the full width at half maximum. A set of mathematical approaches must be developed for these applications, some of them are standard in wide sense, even if very complex. One is essential and, in its absence, all the others are useless. Therefore, in this paper, we report the details of this critical approach. It extracts physical properties of the detectors, and allows the insertion of the functional dependence from the impact point in the probability distributions. Other papers will be dedicated to the remaining parts.

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。

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