Difference between revisions of "Mattione Kaon PID Studies Y2175"

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== Signal / Background Ratios ==
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=== Raw Ratios ===
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* Signal / Background Ratios
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{| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;"
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!width="75"| Detector / PID Cut
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!width="350"| Missing p, No KinFit
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!width="350"| Missing p, P4 KinFit
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!width="350"| Missing p, VertexP4 KinFit
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!width="350"| No Missing, No KinFit
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!width="350"| No Missing, P4 KinFit
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!width="350"| No Missing, VertexP4 KinFit
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|-
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! No CKOV
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|  ||  ||  ||  ||  ||
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|-
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! He DC, Inclusive Kaon
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|  ||  ||  ||  ||  ||
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|-
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! Gas Thresh., Inclusive Kaon
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|  ||  ||  ||  ||  ||
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|-
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! HBRICH, Inclusive Kaon
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|-
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! LHCb RICH, Inclusive Kaon
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|-
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! He DC, Exclusive Kaon
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|-
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! Gas Thresh., Exclusive Kaon
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|-
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! HBRICH, Exclusive Kaon
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|  ||  ||  ||  ||  ||
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|-
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! LHCb RICH, Exclusive Kaon
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|}
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=== Improvements Over No CKOV ===
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== Yields %'s ==
 
== Yields %'s ==
 
* ALL yield %'s are determined in the signal region (track combinations with invariant mass outside of the signal region are ignored)
 
* ALL yield %'s are determined in the signal region (track combinations with invariant mass outside of the signal region are ignored)
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Revision as of 22:52, 23 September 2012

Reaction

  • γ p → Y(2175), p
    • Y(2175) → f0(980)0, φ
      • f0(980)0 → π+, π-
        • φ → K+, K-
  • 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
Mattione Update 09132012 KinFitConLev MissingP VertexP4KinFit Y2175.png
Mattione Update 09132012 KinFitConLev MissingP VertexP4KinFit Y2175bkgnd.png
Mattione Update 09132012 KinFitConLev MissingP VertexP4KinFit Y2175bggen.png
Missing Mass
Mattione Update 09132012 MissingMass MissingP VertexP4KinFit Y2175.png
Mattione Update 09132012 MissingMass MissingP VertexP4KinFit Y2175bkgnd.png
Mattione Update 09132012 MissingMass MissingP VertexP4KinFit Y2175bggen.png
φ Mass
Mattione Update 09132012 PhiMass MissingP VertexP4KinFit Y2175.png
Mattione Update 09132012 PhiMass MissingP VertexP4KinFit Y2175bkgnd.png
Mattione Update 09132012 PhiMass MissingP VertexP4KinFit Y2175bggen.png
Y(2175) Mass
Mattione Update 09132012 Y2175Mass MissingP VertexP4KinFit Y2175.png
Mattione Update 09132012 Y2175Mass MissingP VertexP4KinFit Y2175bkgnd.png
Mattione Update 09132012 Y2175Mass MissingP VertexP4KinFit Y2175bggen.png


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
Mattione Update 09132012 PVsTheta PiPlusPassKPlus All MissingP VertexP4KinFit Y2175bkgnd.png
 NA NA
He DC 23.57%
Mattione Update 09132012 PVsTheta PiPlusPassKPlus FailedHeDC MissingP VertexP4KinFit Y2175bkgnd.png
Mattione Update 09132012 PVsTheta PiPlusPassKPlus PassedHeDC MissingP VertexP4KinFit Y2175bkgnd.png
Gas Threshold 10.24%
Mattione Update 09132012 PVsTheta PiPlusPassKPlus FailedGasThresh MissingP VertexP4KinFit Y2175bkgnd.png
Mattione Update 09132012 PVsTheta PiPlusPassKPlus PassedGasThresh MissingP VertexP4KinFit Y2175bkgnd.png
HBRICH 98.40%
Mattione Update 09132012 PVsTheta PiPlusPassKPlus FailedRICH MissingP VertexP4KinFit Y2175bkgnd.png
Mattione Update 09132012 PVsTheta PiPlusPassKPlus PassedRICH MissingP VertexP4KinFit Y2175bkgnd.png
LHCb RICH 98.01%
Mattione Update 09132012 PVsTheta PiPlusPassKPlus FailedLHCbRICH MissingP VertexP4KinFit Y2175bkgnd.png
Mattione Update 09132012 PVsTheta PiPlusPassKPlus PassedLHCbRICH MissingP VertexP4KinFit Y2175bkgnd.png


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
Mattione Update 09132012 PVsTheta PiPlusPassKPlus All MissingP VertexP4KinFit Y2175bggen.png
 NA NA
He DC 22.92%
Mattione Update 09132012 PVsTheta PiPlusPassKPlus FailedHeDC MissingP VertexP4KinFit Y2175bggen.png
Mattione Update 09132012 PVsTheta PiPlusPassKPlus PassedHeDC MissingP VertexP4KinFit Y2175bggen.png
Gas Threshold 7.55%
Mattione Update 09132012 PVsTheta PiPlusPassKPlus FailedGasThresh MissingP VertexP4KinFit Y2175bggen.png
Mattione Update 09132012 PVsTheta PiPlusPassKPlus PassedGasThresh MissingP VertexP4KinFit Y2175bggen.png
HBRICH 56.77%
Mattione Update 09132012 PVsTheta PiPlusPassKPlus FailedRICH MissingP VertexP4KinFit Y2175bggen.png
Mattione Update 09132012 PVsTheta PiPlusPassKPlus PassedRICH MissingP VertexP4KinFit Y2175bggen.png
LHCb RICH 60.42%
Mattione Update 09132012 PVsTheta PiPlusPassKPlus FailedLHCbRICH MissingP VertexP4KinFit Y2175bggen.png
Mattione Update 09132012 PVsTheta PiPlusPassKPlus PassedLHCbRICH MissingP VertexP4KinFit Y2175bggen.png


Signal / Background Ratios

Raw Ratios

  • Signal / Background Ratios
Detector / PID Cut Missing p, No KinFit Missing p, P4 KinFit Missing p, VertexP4 KinFit No Missing, No KinFit No Missing, P4 KinFit No Missing, VertexP4 KinFit
No CKOV
He DC, Inclusive Kaon
Gas Thresh., Inclusive Kaon
HBRICH, Inclusive Kaon
LHCb RICH, Inclusive Kaon
He DC, Exclusive Kaon
Gas Thresh., Exclusive Kaon
HBRICH, Exclusive Kaon
LHCb RICH, Exclusive Kaon


Improvements Over No CKOV

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