Mattione Kaon PID Studies phi3(1850)
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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 : P Missing
- NOTES:
- Plots are shown for "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.
- If a cut is shown, then all "Post-KinFit" plots after that cut include it.
| Plot | genr8 φ3(1850) Signal | genr8 φ3(1850) Background | bggen Background |
|---|---|---|---|
| Confidence Level |  |
 |
 |
| Missing Mass |  |
 |
 |
| φ3(1850) Mass |  |
 |
 |
Mass Peaks & Kinematic Fitting: No Missing
- NOTES:
- Plots are shown for "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.
- If a cut is shown, then all "Post-KinFit" plots after that cut include it.
| Plot | genr8 φ3(1850) Signal | genr8 φ3(1850) Background | bggen Background |
|---|---|---|---|
| Confidence Level |  |
 |
 |
| Missing Mass Squared |  |
 |
 |
| 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.
| Detector | % of Pions That Fail Kaon Cut | Pions That Fail Kaon Cut | Pions That Survive Kaon Cut |
|---|---|---|---|
| No CKOV |  |
NA | NA |
| He DC | 39.13% |  |
 |
| Gas Threshold | 46.58% |  |
 |
| HBRICH | 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.
| Detector | % of Pions That Fail Kaon Cut | Pions That Fail Kaon Cut | Pions That Survive Kaon Cut |
|---|---|---|---|
| No CKOV |  |
NA | NA |
| He DC | 29.32% |  |
 |
| Gas Threshold | 40.64% |  |
 |
| HBRICH | 54.70% |  |
 |
| LHCb RICH | 75.50% |  |
 |
Yield %'s & Signal / Background Ratios
- ALL data are determined from Eγ = 8.5 - 9.0 GeV
Yield %'s
- % of generated events remaining after all cuts
| Detector / PID Cut | Missing p, No Fit | Missing p, P4 Fit | Missing p, VertexP4 Fit | No Missing, No Fit | No Missing, P4 Fit | No Missing, VertexP4 Fit |
|---|---|---|---|---|---|---|
| No CKOV | 25.7213% | 29.4203% | 27.1151% | 16.1225% | 12.8963% | 11.6797% |
| He DC K: 1 Exclusive |
19.1337% | 21.2739% | 19.7511% | 11.7985% | 9.22241% | 8.37895% |
| Gas Threshold K: 1 Exclusive |
23.3831% | 26.3302% | 24.3453% | 14.1469% | 11.0374% | 9.99005% |
| HBRICH K: 1 Exclusive |
25.2832% | 28.441% | 26.3715% | 15.6175% | 12.3001% | 11.1512% |
| LHCb RICH K: 1 Exclusive |
25.314% | 28.2104% | 26.1134% | 15.397% | 11.9929% | 10.8679% |
Exclusive Kaon Cut Signal Yield Loss
- % of pre-CKOV signal events LOST due to exclusive Kaon cut
| Detector / PID Cut | Missing p, No Fit | Missing p, P4 Fit | Missing p, VertexP4 Fit | No Missing, No Fit | No Missing, P4 Fit | No Missing, VertexP4 Fit |
|---|---|---|---|---|---|---|
| He DC K: 1 Exclusive |
25.6113% | 27.6896% | 27.1582% | 26.8195% | 28.4879% | 28.2606% |
| Gas Threshold K: 1 Exclusive |
9.09038% | 10.5033% | 10.2149% | 12.2539% | 14.4145% | 14.4665% |
| HBRICH K: 1 Exclusive |
1.70343% | 3.32855% | 2.74221% | 3.13199% | 4.62312% | 4.52537% |
| LHCb RICH K: 1 Exclusive |
1.58339% | 4.11241% | 3.69439% | 4.49982% | 7.00475% | 6.95065% |
Signal / Background Ratios
- Signal / Background Ratios
| Detector / PID Cut | Missing p, No Fit | Missing p, P4 Fit | Missing p, VertexP4 Fit | No Missing, No Fit | No Missing, P4 Fit | No Missing, VertexP4 Fit |
|---|---|---|---|---|---|---|
| No CKOV | 0.014492 | 0.00975441 | 0.0195118 | 0.0598644 | 0.658394 | 1.07163 |
| He DC K: Inclusive |
0.0206374 | 0.0135749 | 0.0331994 | 0.108714 | 0.807195 | 1.13469 |
| Gas Threshold K: Inclusive |
0.0242515 | 0.0154948 | 0.0433289 | 0.164763 | 0.903101 | 1.15175 |
| HBRICH K: Inclusive |
0.0341672 | 0.0207034 | 0.0583342 | 0.246588 | 0.926807 | 1.15841 |
| LHCb RICH K: Inclusive |
0.0286688 | 0.0179156 | 0.0501617 | 0.211342 | 0.910341 | 1.15521 |
| He DC K: 1 Exclusive |
0.0570553 | 0.0374778 | 0.0840888 | 0.245871 | 1.05639 | 1.23877 |
| Gas Threshold K: 1 Exclusive |
0.0704103 | 0.0466157 | 0.115124 | 0.300781 | 1.0219 | 1.11751 |
| HBRICH K: 1 Exclusive |
0.0968646 | 0.0627223 | 0.154364 | 0.40461 | 1.08359 | 1.14907 |
| LHCb RICH K: 1 Exclusive |
0.0869476 | 0.0562729 | 0.137432 | 0.379736 | 1.10968 | 1.22991 |
Signal / Background Ratios : Improvements Over No CKOV
- Detector Signal / Background Ratio (StBR) DIVIDED BY No CKOV StBR
| Detector / PID Cut | Missing p, No Fit | Missing p, P4 Fit | Missing p, VertexP4 Fit | No Missing, No Fit | No Missing, P4 Fit | No Missing, VertexP4 Fit |
|---|---|---|---|---|---|---|
| He DC K: Inclusive |
1.42405 | 1.39167 | 1.7015 | 1.816 | 1.22601 | 1.05884 |
| Gas Threshold K: Inclusive |
1.67344 | 1.5885 | 2.22065 | 2.75227 | 1.37167 | 1.07477 |
| HBRICH K: Inclusive |
2.35766 | 2.12246 | 2.98968 | 4.11911 | 1.40768 | 1.08098 |
| LHCb RICH K: Inclusive |
1.97825 | 1.83667 | 2.57083 | 3.53035 | 1.38267 | 1.07799 |
| He DC K: 1 Exclusive |
3.93702 | 3.84214 | 4.30963 | 4.10714 | 1.6045 | 1.15596 |
| Gas Threshold K: 1 Exclusive |
4.85856 | 4.77893 | 5.90022 | 5.02437 | 1.55211 | 1.04281 |
| HBRICH K: 1 Exclusive |
6.684 | 6.43015 | 7.91128 | 6.75878 | 1.6458 | 1.07227 |
| LHCb RICH K: 1 Exclusive |
5.99969 | 5.76897 | 7.04351 | 6.34328 | 1.68544 | 1.1477 |
