Difference between revisions of "Mattione Kaon PID Studies eta1Prime(2300)"
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!width="350"| No Missing, VertexP4 KinFit | !width="350"| No Missing, VertexP4 KinFit | ||
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− | | || 1.50% || 1.73% || || | + | | || 1.50% || 1.73% || || || |
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|- | |- | ||
! w/o CKOV | ! w/o CKOV | ||
− | | || 0.61% || 0.58% || || | + | | || 0.61% || 0.58% || || || |
|- | |- | ||
! He DC | ! He DC | ||
− | | || 0.59% || 0.56% || || | + | | || 0.59% || 0.56% || || || |
|- | |- | ||
! Gas Thresh. | ! Gas Thresh. | ||
− | | || 0.60% || 0.57% || || | + | | || 0.60% || 0.57% || || || |
|- | |- | ||
! RICH (Yi) | ! RICH (Yi) | ||
− | | || 0.58% || 0.55% || || | + | | || 0.58% || 0.55% || || || |
|- | |- | ||
! LHCb RICH | ! LHCb RICH | ||
− | | || 0.57% || 0.54% || || | + | | || 0.57% || 0.54% || || || |
|} | |} | ||
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|- | |- | ||
! w/o CKOV | ! w/o CKOV | ||
− | | || 0.94% || 1.01% || || | + | | || 0.94% || 1.01% || || || |
|- | |- | ||
! He DC | ! He DC | ||
− | | || 0.67% || 0.72% || || | + | | || 0.67% || 0.72% || || || |
|- | |- | ||
! Gas Thresh. | ! Gas Thresh. | ||
− | | || 0.60% || 0.68% || || | + | | || 0.60% || 0.68% || || || |
|- | |- | ||
! RICH (Yi) | ! RICH (Yi) | ||
− | | || 0.33% || 0.32% || || | + | | || 0.33% || 0.32% || || || |
|- | |- | ||
! LHCb RICH | ! LHCb RICH | ||
− | | || 0.23% || 0.23% || || | + | | || 0.23% || 0.23% || || || |
|} | |} | ||
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|- | |- | ||
! w/o CKOV | ! w/o CKOV | ||
− | | || 0.026% || 0.0053% || || | + | | || 0.026% || 0.0053% || || || |
|- | |- | ||
! He DC | ! He DC | ||
− | | || 0.023% || 0.0041% || || | + | | || 0.023% || 0.0041% || || || |
|- | |- | ||
! Gas Thresh. | ! Gas Thresh. | ||
− | | || 0.023% || 0.0043% || || | + | | || 0.023% || 0.0043% || || || |
|- | |- | ||
! RICH (Yi) | ! RICH (Yi) | ||
− | | || 0.018% || 0.0029% || || | + | | || 0.018% || 0.0029% || || || |
|- | |- | ||
! LHCb RICH | ! LHCb RICH | ||
− | | || 0.017% || 0.0026% || || | + | | || 0.017% || 0.0026% || || || |
|} | |} | ||
<br style="clear:both;"/> | <br style="clear:both;"/> |
Revision as of 01:43, 17 September 2012
Contents
Reaction
- γ p → η'1(2300), p
- η'1(2300) → K*(892)0, K0_bar
- K*(892)0 → K+, π-
- K0_bar → π+, π-
- K*(892)0 → K+, π-
- η'1(2300) → K*(892)0, K0_bar
- Final State: p, K+, π-, π+, π-
- Events generated with: Γη'1(2300) = 200 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 η'1(2300) Signal | genr8 η'1(2300) Background | bggen Background |
---|---|---|---|
Confidence Level | |||
K0 Mass | |||
Missing Mass | |||
K*(892)0 Mass | |||
η'1(2300) Mass |
Cherenkov Detector Comparison
genr8 η'1(2300) Background
- 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 | 30.02% | ||
Gas Threshold | 36.01% | ||
RICH | 71.93% | ||
LHCb RICH | 81.41% |
bggen Background
- 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 | 26.01% | ||
Gas Threshold | 32.77% | ||
RICH | 51.69% | ||
LHCb RICH | 64.86% |
Yields %'s
- ALL yield %'s are determined in the signal region (track combinations with invariant mass outside of the signal region are ignored)
genr8 η'1(2300) 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 |
---|---|---|---|---|---|
1.50% | 1.73% |
- % 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 | 0.61% | 0.58% | ||||
He DC | 0.59% | 0.56% | ||||
Gas Thresh. | 0.60% | 0.57% | ||||
RICH (Yi) | 0.58% | 0.55% | ||||
LHCb RICH | 0.57% | 0.54% |
genr8 η'1(2300) 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 | 0.94% | 1.01% | ||||
He DC | 0.67% | 0.72% | ||||
Gas Thresh. | 0.60% | 0.68% | ||||
RICH (Yi) | 0.33% | 0.32% | ||||
LHCb RICH | 0.23% | 0.23% |
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 | 0.026% | 0.0053% | ||||
He DC | 0.023% | 0.0041% | ||||
Gas Thresh. | 0.023% | 0.0043% | ||||
RICH (Yi) | 0.018% | 0.0029% | ||||
LHCb RICH | 0.017% | 0.0026% |