Difference between revisions of "Mattione Kaon PID Studies Y2175"
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Revision as of 22:53, 23 September 2012
Contents
Reaction
- γ p → Y(2175), p
- Y(2175) → f0(980)0, φ
- f0(980)0 → π+, π-
- φ → K+, K-
- f0(980)0 → π+, π-
- Y(2175) → f0(980)0, φ
- Final State: p, π+, π-, K+, K-
- Events generated with: ΓY(2175) = 61 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 Y(2175) Signal | genr8 Y(2175) Background | bggen Background |
---|---|---|---|
Confidence Level | |||
Missing Mass | |||
φ Mass | |||
Y(2175) Mass |
Cherenkov Detector Comparison
genr8 Y(2175) 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 | 23.57% | ||
Gas Threshold | 10.24% | ||
HBRICH | 98.40% | ||
LHCb RICH | 98.01% |
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 | 22.92% | ||
Gas Threshold | 7.55% | ||
HBRICH | 56.77% | ||
LHCb RICH | 60.42% |
Signal / Background Ratios
Raw 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 | ||||||
He DC, K: Inclusive | ||||||
Gas Thresh., K: Inclusive | ||||||
HBRICH, K: Inclusive | ||||||
LHCb RICH, K: Inclusive | ||||||
He DC, K: 1 Exclusive | ||||||
Gas Thresh., K: 1 Exclusive | ||||||
HBRICH, K: 1 Exclusive | ||||||
LHCb RICH, K: 1 Exclusive |