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HLT2/lines: Tune charm detection asymmetry lines

Laurent Dufour requested to merge ld-tune-adet-charm-lines into master

A few cuts are added to the detection asymmetry lines in the charm module, based on some first analysis of the lines' output. These changes should cut the rate of the Ds -> pi pi pi and /\c -> p X lines down by > 2x.

  • Add (PIDK-PIDp) cut to protons in Lc lines to reduce misID background
  • Add a PT cut as well to these
  • Require the charm to decay with a radial distance of 7mm to remove background as well
  • Tighten the mass window for Ds -> pi pi pi, and tighten the IPCHI2 cut. This line had the worst purity.
Edited by Laurent Dufour

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