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SUMMARY:Implementation of a Riemann Helical Fit for GlueX track reconstruc
tion
DTSTART;VALUE=DATE-TIME:20090324T070000Z
DTEND;VALUE=DATE-TIME:20090324T072000Z
DTSTAMP;VALUE=DATE-TIME:20210227T103523Z
UID:indico-contribution-839706@indico.cern.ch
DESCRIPTION:Speakers: Simon Taylor (Jefferson Lab)\nThe future GlueX detec
tor in Hall D at Jefferson Lab is a large acceptance (almost 4pi) spectrom
eter \ndesigned to facilitate the study of the excitation of the gluonic f
ield \nbinding quark--anti-quark pairs into mesons.\nA large solenoidal ma
gnet will provide a 2.2-Tesla field that will be used \nto momentum-analyz
e the charged particles emerging from a liquid hydrogen \ntarget. The tra
jectories\nof forward-going particles will be measured with a set of \nfou
r planar cathode strip drift chamber packages with six layers per package.
\nThe design naturally separates the track into segments where the magneti
c \nfield is relatively constant\, thereby opening up the possibility of p
erforming\nlocal helical fits to the data within individual packages. We
have \nimplemented the Riemann Helical Fit algorithm to fit the track \nse
gments. \nThe Riemann Helical Fit is a fast and elegant algorithm combinin
g a circle fit\nfor determining the transverse momentum and a line fit for
determining the dip angle and \ninitial z value that does not require com
putation of any derivative matrices.\nThe track segments are then linked t
ogether by swimming through the field from \none package to the next to fo
rm track candidates. A comparison between \nthe Riemann Circle Fit and a
simple linear regression method that assumes that \nthe origin is on the c
ircle will be presented. A comparison between \nthe Riemann Helical Fit a
nd a full least-squares fit with a non-uniform \nmagnetic field will also
be presented.\n\nhttps://indico.cern.ch/event/35523/contributions/839706/
LOCATION:Prague
URL:https://indico.cern.ch/event/35523/contributions/839706/
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