Difference between revisions of "Mattione Kaon PID Studies h2Prime(2600)"
From GlueXWiki
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|- | |- | ||
! w/o CKOV | ! w/o CKOV | ||
− | | || 1.44% || 0.57% || || | + | | || 1.44% || 0.57% || || || |
|- | |- | ||
! He DC | ! He DC | ||
− | | || 1.27% || 0.46% || || | + | | || 1.27% || 0.46% || || || |
|- | |- | ||
! Gas Thresh. | ! Gas Thresh. | ||
− | | || 1.32% || 0.49% || || | + | | || 1.32% || 0.49% || || || |
|- | |- | ||
! RICH (Yi) | ! RICH (Yi) | ||
− | | || 1.08% || 0.35% || || | + | | || 1.08% || 0.35% || || || |
|- | |- | ||
! LHCb RICH | ! LHCb RICH | ||
− | | || 1.06% || 0.34% || || | + | | || 1.06% || 0.34% || || || |
|} | |} | ||
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|- | |- | ||
! w/o CKOV | ! w/o CKOV | ||
− | | || 1.99% || 1.24% || || | + | | || 1.99% || 1.24% || || || |
|- | |- | ||
! He DC | ! He DC | ||
− | | || 1.09% || 0.68% || || | + | | || 1.09% || 0.68% || || || |
|- | |- | ||
! Gas Thresh. | ! Gas Thresh. | ||
− | | || 0.90% || 0.60% || || | + | | || 0.90% || 0.60% || || || |
|- | |- | ||
! RICH (Yi) | ! RICH (Yi) | ||
− | | || 0.37% || 0.16% || || | + | | || 0.37% || 0.16% || || || |
|- | |- | ||
! LHCb RICH | ! LHCb RICH | ||
− | | || 0.12% || 0.042% || || | + | | || 0.12% || 0.042% || || || |
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|- | |- | ||
! w/o CKOV | ! w/o CKOV | ||
− | | || b% || 0.046% || || | + | | || b% || 0.046% || || || |
|- | |- | ||
! He DC | ! He DC | ||
− | | || b% || 0.030% || || | + | | || b% || 0.030% || || || |
|- | |- | ||
! Gas Thresh. | ! Gas Thresh. | ||
− | | || b% || 0.029% || || | + | | || b% || 0.029% || || || |
|- | |- | ||
! RICH (Yi) | ! RICH (Yi) | ||
− | | || b% || 0.013% || || | + | | || b% || 0.013% || || || |
|- | |- | ||
! LHCb RICH | ! LHCb RICH | ||
− | | || b% || 0.011% || || | + | | || b% || 0.011% || || || |
|} | |} | ||
<br style="clear:both;"/> | <br style="clear:both;"/> |
Revision as of 01:44, 17 September 2012
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.
Design | % of Pions That Fail Kaon Cut | Pions That Fail Kaon Cut | Pions That Survive Kaon Cut |
---|---|---|---|
All | NA | NA | |
He DC | 22.20% | ||
Gas Threshold | 20.78% | ||
RICH | 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.
Design | % of Pions That Fail Kaon Cut | Pions That Fail Kaon Cut | Pions That Survive Kaon Cut |
---|---|---|---|
All | NA | NA | |
He DC | 28.86% | ||
Gas Threshold | 35.31% | ||
RICH | 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.
Design | % of Pions That Fail Kaon Cut | Pions That Fail Kaon Cut | Pions That Survive Kaon Cut |
---|---|---|---|
All | NA | NA | |
He DC | 22.87% | ||
Gas Threshold | 20.76% | ||
RICH | 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.
Design | % of Pions That Fail Kaon Cut | Pions That Fail Kaon Cut | Pions That Survive Kaon Cut |
---|---|---|---|
All | NA | NA | |
He DC | 21.69% | ||
Gas Threshold | 28.71% | ||
RICH | 49.84% | ||
LHCb RICH | 59.30% |
Yields %'s
- ALL yield %'s are determined in the signal region (track combinations with invariant mass outside of the signal region are ignored)
genr8 h'2(2600) 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 |
---|---|---|---|---|---|
3.08% | 2.69% | d% | e% |
- % 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 | 1.44% | 0.57% | ||||
He DC | 1.27% | 0.46% | ||||
Gas Thresh. | 1.32% | 0.49% | ||||
RICH (Yi) | 1.08% | 0.35% | ||||
LHCb RICH | 1.06% | 0.34% |
genr8 h'2(2600) 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 | 1.99% | 1.24% | ||||
He DC | 1.09% | 0.68% | ||||
Gas Thresh. | 0.90% | 0.60% | ||||
RICH (Yi) | 0.37% | 0.16% | ||||
LHCb RICH | 0.12% | 0.042% |
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 | b% | 0.046% | ||||
He DC | b% | 0.030% | ||||
Gas Thresh. | b% | 0.029% | ||||
RICH (Yi) | b% | 0.013% | ||||
LHCb RICH | b% | 0.011% |