Difference between revisions of "Mattione Update 09042013"

Revision as of 20:14, 3 September 2013

CDC Track Finding

Single π⁺ Track

Single π⁺ Reconstruction: Current (Trunk) Code, trackeff_hists plugin

• The below plots show the track reconstruction efficiency and resolution for the trunk using the single-track scripts plugin (trackeff_hists).
• However, this efficiency is extremely misleading:
  • If a track is reconstructed using any of the hits that were on the thrown track it is considered "found."
  • This is regardless of whether the reconstructed track momentum is anywhere close to the thrown values.

Current Code: Time-Based Tracks (trackeff_hists plugin)

Current Code: Momentum Resolution (trackeff_hists plugin)

Single π⁺ Reconstruction: Current (Trunk) Code, NEW trackeffv2 plugin

• The below plots show the track candidate and time-based track reconstruction efficiency for the trunk using a new plugin (trackeff_hists).
• This plugin compares matches all of the thrown and reconstructed particles in the event, and requires that their momentum be "close."
  • "Close" for track candidates is defined as: Δp/p < 20%, Δθ < 40 degrees, Δφ < 40 degrees, ΔVertex-Z < 1 km
    • For thrown tracks with θ < 5 degrees, there is no cut on Δφ
  • "Close" for time-based tracks is defined as: Δp/p < 10%, Δθ < 15 degrees, Δφ < 15 degrees, ΔVertex-Z < 10 cm

Current Code: Track Candidates (trackeffv2 plugin)

Current Code: Time-Based Tracks (trackeffv2 plugin)

• Note that the degradation of the efficiency at forward angles matches the track resolution plot in the previous section.
  • If I expand the requirements for the "Close" window, the efficiency increases, and the chosen parameters were somewhat arbitrary.

Single π⁺ Reconstruction: NEW Spiral Code

• The below plots show the track candidate and time-based track reconstruction efficiencies for the new spiral code.
• Note: The trackeffv2 plugin compares matches all of the thrown and reconstructed particles in the event, and requires that their momentum be "close."
  • "Close" for track candidates is defined as: Δp/p < 20%, Δθ < 40 degrees, Δφ < 40 degrees, ΔVertex-Z < 1 km
    • For thrown tracks with θ < 5 degrees, there is no cut on Δφ
  • "Close" for time-based tracks is defined as: Δp/p < 10%, Δθ < 15 degrees, Δφ < 15 degrees, ΔVertex-Z < 10 cm

Spiral Code: Track Candidates Efficiency (Spiral Code)

Spiral Code: Time-Based Track Efficiency (Spiral Code)

• The below plots show the improvements in the track candidate and time-based track reconstruction efficiencies with the new spiral code.

Track Candidate Efficiency Improvement	Zoomed Track Candidate Efficiency Improvement
Time-Based Track Efficiency Improvement	Zoomed Time-Based Track Efficiency Improvement

γp→π⁺π^-p (ρ Mesons)

• The below plots show the track candidate and time-based track reconstruction efficiencies for both track finding codes, and the improvement.
• The definition of closeness is the same as before (see the single-track section).
• Events were generated at beam energy of 9 GeV and a t-slope of 5.0

Protons

π⁺

π^-

γp→π⁺π⁺π^-(n)

γp→π⁺π⁺π^-π^-π⁰(p) (b1pi)

bggen (pythia)

γp→K⁺K⁺Ξ^-