27 September 2004 to 1 October 2004
Interlaken, Switzerland
Europe/Zurich timezone

A Gaussian-sum filter for vertex reconstruction

30 Sep 2004, 17:10
20m
Kongress-Saal (Interlaken, Switzerland)

Kongress-Saal

Interlaken, Switzerland

oral presentation Track 2 - Event processing Event Processing

Speaker

Dr T. Speer (UNIVERSITY OF ZURICH, SWITZERLAND)

Description

A vertex fit algorithm was developed based on the Gaussian-sum filter (GSF) and implemented in the framework of the CMS reconstruction program. While linear least-squares estimators are optimal in case all observation errors are Gaussian distributed, the GSF offers a better treatment of the non-Gaussian distribution of track parameter errors when these are modeled by Gaussian mixtures. In addition, when using electron tracks reconstructed with an electron-reconstruction Gaussian-sum filter, the full mixture can be used rather than the approximation by a single Gaussian. Properties, results and performance of this filter with simulated data will be shown, and compared to the Kalman filter and to robust filters.

Primary authors

Prof. R. Fruehwirth (Institut für Hochenergiephysik der OAW, Vienna, Austria) Dr T. Speer (UNIVERSITY OF ZURICH, SWITZERLAND)

Presentation Materials