Difference between revisions of "Mattione Kaon PID Studies phi3(1850)"
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! He DC | ! He DC | ||
| − | | a% || | + | | a% || 10.60% || 6.11% || d% || e% || f% |
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| − | | a% || | + | | a% || 11.08% || 6.56% || d% || e% || f% |
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! RICH (Yi) | ! RICH (Yi) | ||
| − | | a% || | + | | a% || 10.59% || 6.10% || d% || e% || f% |
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! LHCb RICH | ! LHCb RICH | ||
| − | | a% || | + | | a% || 9.90% || 5.44% || d% || e% || f% |
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Revision as of 16:43, 16 September 2012
Contents
Reaction
- γ p → φ3(1850), p
- φ3(1850) → K+, K-
- Final State: p, K+, K-
- Events generated with: Γφ3(1850) = 87 MeV/c2, t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0
Analysis Overview
- For each q = +/- particle in the reaction, all detected q = +/- tracks are tested as to whether or not they are that particle
- e.g. If a q = + track has PID FOM > 1% for both the π+ & K+: allow both combinations (DO NOT take the best FOM as true!)
- Maximum of 8 tracks per event (to cut down on memory spikes).
- The analysis (cuts/histing/kinfits) is then performed on each possible track combination (events are only cut if every one of their track combinations is cut):
- Required 45.0 < Track-Vertex-Z (cm) < 85.0
- EXTREMELY loose mass cuts around each mass peak (typically at the histogram edges): saves time by reducing # of kinematic fits to perform
- Require the combined FOM for PID (χ2 and NDF of all tracks summed together) be > 1%
- Where kinematic fit: Require that the confidence level from the kinematic fit be > 1%
- Mass cuts as illustrated.
Mass Peaks & Kinematic Fitting
- NOTES:
- Plots are shown for "Missing p, VertexP4 KinFit" only.
- Mass Plots: Pre-KinFit is Magenta, Post-KinFit is Teal
- Kinematic Fit Confidence Level is zoomed in: spike at 0 confidence is well off the top of the plot
- For the genr8 background, It wasn't possible to lineup every mass peak (without generating the recoil proton at a bogus mass), so the missing mass peak is a little off-center.
| Plot | genr8 φ3(1850) Signal | genr8 φ3(1850) Background | bggen Background |
|---|---|---|---|
| Confidence Level |  |
 |
 |
| Missing Mass |  |
 |
 |
| φ3(1850) Mass |  |
 |
 |
Cherenkov Detector Comparison
genr8 φ3(1850) Background
- P vs. θ of π+'s as K+ candidates ("All" means all post-analysis cuts, pre-Cherenkov cuts)
- π-'s as K- not shown: identical due to symmetry.
- Plots are shown for "Missing p, VertexP4 KinFit" only.
| Design | % of Pions That Fail Kaon Cut | Pions That Fail Kaon Cut | Pions That Survive Kaon Cut |
|---|---|---|---|
| All |  |
NA | NA |
| He DC | 39.13% |  |
 |
| Gas Threshold | 46.58% |  |
 |
| RICH | 53.69% |  |
 |
| LHCb RICH | 88.03% |  |
 |
bggen Background
- P vs. θ of π+'s as K+ candidates ("All" means all post-analysis cuts, pre-Cherenkov cuts)
- π-'s as K- not shown: identical due to symmetry.
- Plots are shown for "Missing p, VertexP4 KinFit" only.
| Design | % of Pions That Fail Kaon Cut | Pions That Fail Kaon Cut | Pions That Survive Kaon Cut |
|---|---|---|---|
| All |  |
NA | NA |
| He DC | a% Survive, b% Fail |  |
 |
| Gas Threshold | a% Survive, b% Fail |  |
 |
| RICH | a% Survive, b% Fail |  |
 |
| LHCb RICH | a% Survive, b% Fail |  |
 |
Yields %'s
- ALL yield %'s are determined in the signal region (track combinations with invariant mass outside of the signal region are ignored)
genr8 φ3(1850) Signal Events
- % of generated events remaining after all cuts (including a final cut requiring that all tracks have the correct THROWN PID)
| Missing p, No KinFit | Missing p, P4 KinFit | Missing p, VertexP4 KinFit | No Missing, No KinFit | No Missing, P4 KinFit | No Missing, VertexP4 KinFit |
|---|---|---|---|---|---|
| a% | 30.21% | 29.34% | d% | e% | f% |
- % of BAD reconstructed combos remaining (BAD combo: a combo where at least one track has the wrong THROWN PID)
| Stage | Missing p, No KinFit | Missing p, P4 KinFit | Missing p, VertexP4 KinFit | No Missing, No KinFit | No Missing, P4 KinFit | No Missing, VertexP4 KinFit |
|---|---|---|---|---|---|---|
| w/o CKOV | a% | 11.08% | 6.56% | d% | e% | f% |
| He DC | a% | 10.60% | 6.11% | d% | e% | f% |
| Gas Thresh. | a% | 11.08% | 6.56% | d% | e% | f% |
| RICH (Yi) | a% | 10.59% | 6.10% | d% | e% | f% |
| LHCb RICH | a% | 9.90% | 5.44% | d% | e% | f% |
genr8 φ3(1850) Background Events
- % of reconstructed combos remaining
| Stage | Missing p, No KinFit | Missing p, P4 KinFit | Missing p, VertexP4 KinFit | No Missing, No KinFit | No Missing, P4 KinFit | No Missing, VertexP4 KinFit |
|---|---|---|---|---|---|---|
| w/o CKOV | a% | b% | c% | d% | e% | f% |
| He DC | a% | b% | c% | d% | e% | f% |
| Gas Thresh. | a% | b% | c% | d% | e% | f% |
| RICH (Yi) | a% | b% | c% | d% | e% | f% |
| LHCb RICH | a% | b% | c% | d% | e% | f% |
bggen Background Events
- % of reconstructed combos remaining
| Stage | Missing p, No KinFit | Missing p, P4 KinFit | Missing p, VertexP4 KinFit | No Missing, No KinFit | No Missing, P4 KinFit | No Missing, VertexP4 KinFit |
|---|---|---|---|---|---|---|
| w/o CKOV | a% | b% | c% | d% | e% | f% |
| He DC | a% | b% | c% | d% | e% | f% |
| Gas Thresh. | a% | b% | c% | d% | e% | f% |
| RICH (Yi) | a% | b% | c% | d% | e% | f% |
| LHCb RICH | a% | b% | c% | d% | e% | f% |
