Sep 2 – 9, 2007
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A pre-identification for electron reconstruction in the CMS particle-flow algorithm.

Sep 5, 2007, 8:00 AM
10h 10m
Victoria, Canada

Victoria, Canada

Board: 56
poster Event Processing Poster 2


Michele Pioppi (CERN)


In the CMS software, a dedicated electron track reconstruction algorithm, based on a Gaussian Sum Filter (GSF), is used. This algorithm is able to follow an electron along its complete path up to the electromagnetic calorimeter, even in the case of a large amount of Bremsstrahlung emission. Because of the significant CPU consumption of this algorithm, however, it can be run only on a limited number of electron candidates. The standard GSF electron track reconstruction is triggered by the presence of high energy isolated electromagnetic clusters. Instead, a pre-identification algorithm based on both the tracker and the calorimeter has recently been developed. It allows electron tracks to be reconstructed within jets with a good efficiency even for small electron transverse momentum. This algorithm as well as its performance in terms of efficiency, mis-identification probability and timing are presented. Its implementation within the particle-flow algorithm is also described.
Submitted on behalf of Collaboration (ex, BaBar, ATLAS) CMS

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