Generalized Least Squares Fit: the Sequel

For the bias-free pT reconstruction of tracks in the HARP TPC, especially of helical tracks with small pT, and for optimum resolution and charge separation, our `Generalized Least Squares Fit' is the best algorithm currently available. We present an efficient implementation of this fit of a hel...

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Detalles Bibliográficos
Autores principales: Ammosov, V, Boyko, I, Chelkov, G, Dedovitch, D, Dydak, F, Elagin, A, Gostkin, M, Guskov, A, Koreshev, V, Krumshtein, Z, Nefedov, Y, Nikolaev, K, Wotschack, J, Zhemchugov, A
Lenguaje:eng
Publicado: 2006
Materias:
Detectors and Experimental Techniques
Acceso en línea:http://cds.cern.ch/record/1143062
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author Ammosov, V
Boyko, I
Chelkov, G
Dedovitch, D
Dydak, F
Elagin, A
Gostkin, M
Guskov, A
Koreshev, V
Krumshtein, Z
Nefedov, Y
Nikolaev, K
Wotschack, J
Zhemchugov, A
author_facet Ammosov, V
Boyko, I
Chelkov, G
Dedovitch, D
Dydak, F
Elagin, A
Gostkin, M
Guskov, A
Koreshev, V
Krumshtein, Z
Nefedov, Y
Nikolaev, K
Wotschack, J
Zhemchugov, A
author_sort Ammosov, V
collection CERN
description For the bias-free pT reconstruction of tracks in the HARP TPC, especially of helical tracks with small pT, and for optimum resolution and charge separation, our `Generalized Least Squares Fit' is the best algorithm currently available. We present an efficient implementation of this fit of a helical track, based on the TOPAZ parametrization. Apart from the fast convergence in typically three iterations, our fit allows for change of charge sign in the search for minimum Chi2, which permits optimum charge separation capability. For typical HARP TPC coordinate errors, our fit achieves a 12% better pT resolution than obtained with the original `Chernov-Ososkov' circle fit, and by a factor of two smaller charge misidentification probability at pT= 15 GeV/c.
id cern-1143062
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2006
record_format invenio
spelling cern-11430622019-09-30T06:29:59Zhttp://cds.cern.ch/record/1143062engAmmosov, VBoyko, IChelkov, GDedovitch, DDydak, FElagin, AGostkin, MGuskov, AKoreshev, VKrumshtein, ZNefedov, YNikolaev, KWotschack, JZhemchugov, AGeneralized Least Squares Fit: the SequelDetectors and Experimental TechniquesFor the bias-free pT reconstruction of tracks in the HARP TPC, especially of helical tracks with small pT, and for optimum resolution and charge separation, our `Generalized Least Squares Fit' is the best algorithm currently available. We present an efficient implementation of this fit of a helical track, based on the TOPAZ parametrization. Apart from the fast convergence in typically three iterations, our fit allows for change of charge sign in the search for minimum Chi2, which permits optimum charge separation capability. For typical HARP TPC coordinate errors, our fit achieves a 12% better pT resolution than obtained with the original `Chernov-Ososkov' circle fit, and by a factor of two smaller charge misidentification probability at pT= 15 GeV/c.CERN-HARP-CDP-2006-005HARP Memo 06-103oai:cds.cern.ch:11430622006-10-13
spellingShingle Detectors and Experimental Techniques
Ammosov, V
Boyko, I
Chelkov, G
Dedovitch, D
Dydak, F
Elagin, A
Gostkin, M
Guskov, A
Koreshev, V
Krumshtein, Z
Nefedov, Y
Nikolaev, K
Wotschack, J
Zhemchugov, A
Generalized Least Squares Fit: the Sequel
title Generalized Least Squares Fit: the Sequel
title_full Generalized Least Squares Fit: the Sequel
title_fullStr Generalized Least Squares Fit: the Sequel
title_full_unstemmed Generalized Least Squares Fit: the Sequel
title_short Generalized Least Squares Fit: the Sequel
title_sort generalized least squares fit: the sequel
topic Detectors and Experimental Techniques
url http://cds.cern.ch/record/1143062
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