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This is a writeup from the author on the helix model its parametrization and the various formula that are used in the implementation of the mathematical (StHelix) and physical (StPhysicalHelix) helix model in the STAR Class Library. If you look for a comprehensive explanation of the meaning of the various parameters and the math that is used - this is the place to look.
The original is a TeX document. The following pages are in PNG format and sufficient to view on the screen. There's also a PDF version (helix.pdf) shipped with this version of the hxBrowser.
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