Difference between revisions of "Mattione Update 09042013"
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= CDC Track Finding - Overview = | = CDC Track Finding - Overview = | ||
+ | # Build Super Layer Seeds | ||
+ | # Link Super Layer Seeds | ||
+ | <!-- | ||
+ | = CDC Track Finding - Details = | ||
=== Build Super Layer Seeds === | === Build Super Layer Seeds === | ||
* In each ring, link adjacent hits together (DCDCRingSeed). | * In each ring, link adjacent hits together (DCDCRingSeed). | ||
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** For example, forward-going tracks that are near in φ to large-angle tracks: these track circles will often pick up hits that were on the large-angle track, causing that track to be rejected during filtering below. | ** For example, forward-going tracks that are near in φ to large-angle tracks: these track circles will often pick up hits that were on the large-angle track, causing that track to be rejected during filtering below. | ||
* | * | ||
− | + | --> | |
− | + | ||
− | + | ||
= Single π<sup>+</sup> Track = | = Single π<sup>+</sup> Track = | ||
=== Single π<sup>+</sup> Reconstruction: Current (Trunk) Code, trackeff_hists plugin === | === Single π<sup>+</sup> Reconstruction: Current (Trunk) Code, trackeff_hists plugin === |
Revision as of 03:04, 4 September 2013
Contents
CDC Track Finding - Overview
- Build Super Layer Seeds
- Link Super Layer Seeds
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.
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 the candidate Δφ
- "Close" for time-based tracks is defined as: Δp/p < 10%, Δθ < 15 degrees, Δφ < 15 degrees, ΔVertex-Z < 10 cm
- "Close" for track candidates is defined as: Δp/p < 20%, Δθ < 40 degrees, Δφ < 40 degrees, ΔVertex-Z < 1 km
- 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 the candidate Δφ
- "Close" for time-based tracks is defined as: Δp/p < 10%, Δθ < 15 degrees, Δφ < 15 degrees, ΔVertex-Z < 10 cm
- "Close" for track candidates is defined as: Δp/p < 20%, Δθ < 40 degrees, Δφ < 40 degrees, ΔVertex-Z < 1 km
- The below plots show the improvements in the track candidate and time-based track reconstruction efficiencies with the new spiral code.
γp→π+π+π-(n)
- 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
π+
- Thrown
- Efficiencies
Stage | Efficiency - Current Code | Efficiency - Spiral Code | Improvement | Improvement - Zoomed |
---|---|---|---|---|
Track Candidates | ||||
Time-Based Tracks |
γp→π+π+π-π-π0(p) (b1pi)
- 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 with a beam energy of 9 GeV and a t-slope of 5.0
π-
- Thrown
- Efficiencies
Stage | Efficiency - Current Code | Efficiency - Spiral Code | Improvement | Improvement - Zoomed |
---|---|---|---|---|
Track Candidates | ||||
Time-Based Tracks |
Proton
- Thrown
- Efficiencies
Stage | Efficiency - Current Code | Efficiency - Spiral Code | Improvement |
---|---|---|---|
Track Candidates | |||
Time-Based Tracks |
bggen (pythia)
- 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 with beam energies between 8.4 and 9 GeV
π-
- Thrown
- Efficiencies
Stage | Efficiency - Current Code | Efficiency - Spiral Code | Improvement | Improvement - Zoomed |
---|---|---|---|---|
Track Candidates | ||||
Time-Based Tracks |
Proton
- Thrown
- Efficiencies
Stage | Efficiency - Current Code | Efficiency - Spiral Code | Improvement | Improvement - Zoomed |
---|---|---|---|---|
Track Candidates | ||||
Time-Based Tracks |
γp→K+K+Ξ-
- 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 with beam energies between 8.4 and 9 GeV
π-
- Thrown
- Efficiencies
Stage | Efficiency - Current Code | Efficiency - Spiral Code | Improvement | Improvement - Zoomed |
---|---|---|---|---|
Track Candidates | ||||
Time-Based Tracks |
K+
- Thrown
- Efficiencies
Stage | Efficiency - Current Code | Efficiency - Spiral Code | Improvement | Improvement - Zoomed |
---|---|---|---|---|
Track Candidates | ||||
Time-Based Tracks |
Proton
- Thrown
- Efficiencies
Stage | Efficiency - Current Code | Efficiency - Spiral Code | Improvement |
---|---|---|---|
Track Candidates | |||
Time-Based Tracks |