Mattione Kaon PID Studies h2Prime(2600)
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Contents
Reaction
- γ p → h'2(2600), p
- h'2(2600) → K1(1400)+, K-
- K1(1400)+ → K*(892)0, π+
- K*(892)0 → K+, π-
- K1(1400)+ → K*(892)0, π+
- h'2(2600) → K1(1400)+, K-
- Final State: p, K-, π+, K+, π-
- Events generated with: Γh'2(2600) = 100 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.
- If a cut is shown, then all "Post-KinFit" plots after that cut include it.
| Plot | genr8 h'2(2600) Signal | genr8 h'2(2600) Background | bggen Background |
|---|---|---|---|
| Confidence Level |  |
 |
 |
| Missing Mass |  |
 |
 |
| K*(892)0 Mass |  |
 |
 |
| K1(1400)+ Mass |  |
 |
 |
| h'2(2600) Mass |  |
 |
 |
Cherenkov Detector Comparison
genr8 h'2(2600) Background: K+'s
- P vs. θ of π+'s as K+ candidates ("All" means all post-analysis cuts, pre-Cherenkov cuts)
- 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 | 22.20% |  |
 |
| Gas Threshold | 20.78% |  |
 |
| HBRICH | 76.86% |  |
 |
| LHCb RICH | 79.25% |  |
 |
genr8 h'2(2600) Background: K-'s
- P vs. θ of π-'s as K- candidates ("All" means all post-analysis cuts, pre-Cherenkov cuts)
- 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 | 28.86% |  |
 |
| Gas Threshold | 35.31% |  |
 |
| HBRICH | 50.99% |  |
 |
| LHCb RICH | 67.77% |  |
 |
bggen Background: K+'s
- P vs. θ of π+'s as K+ candidates ("All" means all post-analysis cuts, pre-Cherenkov cuts)
- 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 | 22.87% |  |
 |
| Gas Threshold | 20.76% |  |
 |
| HBRICH | 65.65% |  |
 |
| LHCb RICH | 71.76% |  |
 |
bggen Background: K-'s
- P vs. θ of π-'s as K- candidates ("All" means all post-analysis cuts, pre-Cherenkov cuts)
- 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 | 21.69% |  |
 |
| Gas Threshold | 28.71% |  |
 |
| HBRICH | 49.84% |  |
 |
| LHCb RICH | 59.30% |  |
 |
Yield %'s & Signal / Background Ratios
- ALL data are determined in the signal region (track combinations with invariant mass outside of the signal region are ignored), and from Eγ = 8.5 - 9.0 GeV
Yield %'s
- % of generated events remaining after all cuts (including a final cut requiring that all tracks have the correct THROWN PID)
| 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 | 5.12568% | 4.95312% | 2.99637% | 2.1999% | 1.31276% | 0.98661% |
| He DC K: 1 Exclusive |
3.40657% | 3.29236% | 2.05918% | 1.514% | 0.925587% | 0.698757% |
| Gas Threshold K: 1 Exclusive |
3.89032% | 3.75968% | 2.31741% | 1.70962% | 1.04419% | 0.785577% |
| HBRICH K: 1 Exclusive |
4.32309% | 4.17475% | 2.61845% | 1.91705% | 1.20329% | 0.909531% |
| LHCb RICH K: 1 Exclusive |
4.07889% | 3.92964% | 2.43328% | 1.79283% | 1.10076% | 0.829916% |
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 |
33.5392% | 33.5296% | 31.2778% | 31.1785% | 29.4932% | 29.176% |
| Gas Threshold K: 1 Exclusive |
24.1013% | 24.0946% | 22.6596% | 22.2864% | 20.4583% | 20.3761% |
| HBRICH K: 1 Exclusive |
15.6583% | 15.7148% | 12.6127% | 12.8576% | 8.33888% | 7.8125% |
| LHCb RICH K: 1 Exclusive |
20.4224% | 20.6633% | 18.7925% | 18.5038% | 16.1491% | 15.882% |
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 | 0.000500823 | 0.000570429 | 0.0047081 | 0.00607969 | ||
| He DC K: Inclusive |
0.000619695 | 0.000706717 | 0.00650644 | 0.00859298 | ||
| Gas Threshold K: Inclusive |
0.000680933 | 0.000771428 | 0.00744195 | 0.0103961 | ||
| HBRICH K: Inclusive |
0.00104882 | 0.00115179 | 0.0122539 | 0.0166758 | ||
| LHCb RICH K: Inclusive |
0.000880024 | 0.000983796 | 0.0103902 | 0.0141128 | ||
| He DC K: 1 Exclusive |
0.00135639 | 0.00156158 | 0.0119952 | 0.0154022 | ||
| Gas Threshold K: 1 Exclusive |
0.00144715 | 0.00166568 | 0.0123712 | 0.0151753 | ||
| HBRICH K: 1 Exclusive |
0.00223502 | 0.00253165 | 0.0202096 | 0.0230668 | ||
| LHCb RICH K: 1 Exclusive |
0.0019454 | 0.00222221 | 0.0167062 | 0.0197641 |
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 |
1.23736 | 1.23892 | 1.38197 | 1.41339 | ||
| Gas Threshold K: Inclusive |
1.35963 | 1.35237 | 1.58067 | 1.70997 | ||
| HBRICH K: Inclusive |
2.0942 | 2.01917 | 2.60273 | 2.74287 | ||
| LHCb RICH K: Inclusive |
1.75716 | 1.72466 | 2.20688 | 2.32131 | ||
| He DC K: 1 Exclusive |
2.70832 | 2.73756 | 2.54777 | 2.53338 | ||
| Gas Threshold K: 1 Exclusive |
2.88955 | 2.92005 | 2.62763 | 2.49606 | ||
| HBRICH K: 1 Exclusive |
4.46269 | 4.43816 | 4.29252 | 3.79408 | ||
| LHCb RICH K: 1 Exclusive |
3.88442 | 3.89569 | 3.54839 | 3.25083 |
