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A new technique for the reconstruction, validation, and simulation of hits in the CMS Pixel Detector

机译:用于在CMS Pixel Detector中重建,验证和模拟匹配的新技术

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摘要

This note describes new techniques for the reconstruction/validation and the simulation of pixel hits. The techniques are based upon the use of pre-computed projected cluster shapes or ``templates''. A detailed simulation called Pixelav that has successfully described the profiles of clusters measured in beam tests of radiation-damaged sensors is used to generate the templates. Although the reconstruction technique was originally developed to optimally estimate the coordinates of hits after the detector became radiation damaged, it also has superior performance before irradiation. The technique requires a priori knowledge of the track angle which makes it suitable for the second in a two-pass reconstruction algorithm. However, the same modest angle sensitivity allows the algorithm to determine if the sizes and shapes of the cluster projections are consistent with the input angles. This information may be useful in suppressing spurious hits caused by secondary particles and in validating seeds used in track finding. The seed validation is currently under study but has the potential to significantly increase the speed of track finding in the offline reconstruction. Finally, a new procedure that uses the templates to re-weight clusters generated by the CMSSW simulation is described. The first tests of this technique are encouraging and when fully implemented, the technique will enable the fast simulation of pixel hits that have the characteristics of the much more CPU-intensive Pixelav hits. In particular, it may be the only practical technique available to simulate hits from a radiation damaged detector in CMSSW.
机译:本说明描述了重建/验证和像素命中模拟的新技术。该技术基于对预先计算的投影群集形状或``模板''的使用。已成功描述了在辐射损坏的传感器的光束测试中测量的簇的轮廓的称为Pixelav的详细模拟用于生成模板。尽管重建技术最初是为在探测器受到辐射损坏后最佳估计命中坐标而开发的,但它在辐照前也具有出色的性能。该技术需要先验的跟踪角知识,这使其适合于两次通过重建算法中的第二个。但是,相同的适度角度灵敏度允许算法确定聚类投影的大小和形状是否与输入角度一致。此信息对于抑制由次级粒子引起的虚假命中以及验证跟踪查找中使用的种子可能有用。种子验证目前正在研究中,但有可能显着提高离线重建中寻迹的速度。最后,描述了使用模板重新加权由CMSSW仿真生成的簇的新过程。这项技术的第一个测试令人鼓舞,并且在完全实施后,该技术将能够快速模拟像素命中,而像素命中具有CPU密集型Pixelav命中的特点。特别是,它可能是唯一可用于模拟CMSSW中辐射损坏的检测器的命中的实用技术。

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