arXiv 0810.34152008-10-19hep-exphysics.ins-det

ATLAS的电子和光子识别性能

Electron and Photon Identification Performance in ATLAS

H. J. Kim

备注：: Poster write-up at ICHEP08, Philadelphia, USA, July 2008. 4 pages, LaTeX, 7 eps figures, 2 rtx files, 1 sty file and 1 cls file

摘要：

对电子和光子的重建和校准的理解是启动大型强子对撞机（LHC）ATLAS数据采集的关键步骤之一。热量计单元在被群集之前被电子校准。修正当地的位置和能量测量，考虑到热量计的几何形状。最后，应用纵向重量来校正热量计上游的能量损失。作为最后一步，Z -> ee事件将用于使用Z玻色子质量的原位校准。电子的识别是基于量热计中的簇射形状，并在很大程度上依赖于跟踪器和组合的跟踪器/量热计信息，以实现对QCD喷注的10^5的拒绝，从而获得20-25 GeV以上的合理干净的包容电子谱。对于光子识别，除了量热计中的簇射形状之外，考虑到内部跟踪器中的大量材料，光子转换的恢复是一个必不可少的成分。电子和光子的识别方法（削减和多变量分析）将被讨论。

英文摘要：

The understanding of the reconstruction and calibration of electrons and photons is one of the key steps at the start-up of data-taking with ATLAS at the LHC (Large Hadron Collider). The calorimeter cells are electronically calibrated before being clustered. Corrections to local position and energy measurements are applied to take into account the calorimeter geometry. Finally, longitudinal weights are applied to correct for energy loss upstream of the calorimeter. As a last step the Z -> ee events will be used for in-situ calibration using the Z boson mass. The electron identification is based on the shower shape in the calorimeter and relies heavily on the tracker and combined tracker/calorimeter information to achieve the required rejection of 10^5 against QCD jets for a reasonably clean inclusive electron spectrum above 20-25 GeV. For photon identification, in addition to the shower shape in the calorimeter, recovery of photon conversions is an essential ingredient given the large amount of material in the inner tracker. The electron and photon identification methods (cuts and multivariate analysis) will be discussed.

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摘要：

英文摘要：

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