No. 26 (00108)

Family name : Speer
Given name : Thomas
Affiliation : University of Zurich, Switzerland
Abbreviation : 
E-mail address : Thomas.Speer@cern.ch
Title : Vertex fitting with a Gaussian-sum filter
Authors : R. Fruehwirth and T.Speer
Abstract : 
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-square estimators are optimal in case all
observation errors are Gaussian distributed, a GSF offers a better
treatment of the non-Gaussian distribution of track parameter errors
when these are modeled by Gaussian mixtures.  Results and performance
will be compared to the Kalman filter.