Toward correcting for the Lorentz effect: track segment finder

From GlueXWiki
Revision as of 17:42, 29 May 2007 by Staylor (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

In order to correct for the deflection of the avalanche along the wires due to the Lorentz effect, we need to know how far away from the wire the particle passed through the chamber volume. To this end I have created a new factory in the FDC library that uses the Kalman Filter algorithm to find track segments within a given package. Starting with the most downstream plane of wires in given package, for each point in this plane the code looks back toward the target and associates hits in the remaining planes within a kill radius of 1 cm. Groups of these associated hits are used to form track segments. Shown below is a sample 2-track event where the segments are shown as black lines and the associated FDC hits are red circles. For this type of clean event the code seems to work. Track segments x.gif