Mattione Update 07092012

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Y(2175) Study Overview

Reaction

  • γ p → Y(2175), p
    • Y(2175) → π+, π-, φ
      • φ → K+, K-
  • Final State: p, π+, π-, K+, K-
  • Events generated using genr8 with: 9 GeV Photons, ΓY(2175) = 61 MeV/c2, t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0

Background Channel

  • γ p → f1(1285), p
    • f1(1285) → π+, π-, π+, π-
  • NOTE: had to trick genr8 by having the f1(1285) decay to η, η, and then each decaying to π+, π-
  • Final State: p, π+, π-, π+, π-
  • Events generated using genr8 with: 9 GeV Photons, Γf1(1285) = 24 MeV/c2, t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0

bggen

  • Generated entire photon energy region

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!)
  • 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 reconstruction of >= 2 q+ Tracks, >= 2 q- Tracks (proton is treated as missing)
    • Required 45.0 < Track-Vertex-Z (cm) < 85.0
    • Require the combined FOM for PID (π+, π-, K+, K-) be > 1%
    • Place very loose cuts on the φ invariant mass (0.8 - 1.3) and p missing mass (0.3 - 1.6): reduces # of bogus track combinations to save time / cleanup histograms
    • Phi mass cut: 1.004 < K+K- Invariant Mass (GeV/c2) < 1.04
    • Kinematic Fit: 4-momentum conservation: p missing mass
    • Require that the confidence level from the kinematic fit be > 1%

Y(2175) Study Analysis

  • First Analysis Step:
    • Require reconstruction of >= 2 q+ Tracks, >= 2 q- Tracks (proton is treated as missing)

Thrown Track Parameters

  • Thrown Track Parameters
    • NOTE: Counts in bggen Photon plot are not self consistent with other bggen plot counts (had to cobble it together).
Track Y(2175) f1(1285) bggen
γ Spike at E = 9.0 GeV Spike at E = 9.0 GeV
Mattione Update 07092012 ThrownP Photon Y2175 Pythia.png
K+
Mattione Update 06252012 ThrownPVsTheta KPlus.png
NA
Mattione Update 07092012 ThrownPVsTheta KPlus Y2175 Pythia.png
K-
Mattione Update 06252012 ThrownPVsTheta KMinus.png
NA
Mattione Update 07092012 ThrownPVsTheta KMinus Y2175 Pythia.png
π+
Mattione Update 06252012 ThrownPVsTheta PiPlus.png
Mattione Update 07092012 ThrownPVsTheta PiPlus Y2175 f11285.png
Mattione Update 07092012 ThrownPVsTheta PiPlus Y2175 Pythia.png
π-
Mattione Update 06252012 ThrownPVsTheta PiMinus.png
Mattione Update 07092012 ThrownPVsTheta PiMinus Y2175 f11285.png
Mattione Update 07092012 ThrownPVsTheta PiMinus Y2175 Pythia.png
p
Mattione Update 06252012 ThrownPVsTheta Proton.png
Mattione Update 07092012 ThrownPVsTheta Proton Y2175 f11285.png
Mattione Update 07092012 ThrownPVsTheta Proton Y2175 Pythia.png


Initial Mass Peaks

  • Next Analysis Steps:
    • Required 45.0 < Track-Vertex-Z (cm) < 85.0
    • Require the combined FOM for PID (π+, π-, K+, K-) be > 1%
  • Initial Mass Peaks
    • Note: The peak in the f1(1285) φ-mass plot is due to my forcing the f1(1285) to decay to ηη, with each η decaying to π+π-.
Mass Peak Y(2175) f1(1285) bggen
φ
Mattione Update 07092012 Mass Phi Y2175.png
Mattione Update 07092012 Mass Phi Y2175 f11285.png
Mattione Update 07092012 Mass Phi Y2175 Pythia.png
p
Mattione Update 07092012 Mass Proton Y2175.png
Mattione Update 07092012 Mass Proton Y2175 f11285.png
Mattione Update 07092012 Mass Proton Y2175 Pythia.png
Y(2175)
Mattione Update 07092012 Mass Y2175 Y2175.png
Mattione Update 07092012 Mass Y2175 Y2175 f11285.png
Mattione Update 07092012 Mass Y2175 Y2175 Pythia.png


Kinematic Fitting

  • Next Analysis Steps:
    • Place very loose cuts on the φ invariant mass (0.8 - 1.3) and p missing mass (0.3 - 1.6): reduces # of bogus track combinations to save time / cleanup histograms
    • Phi mass cut: 1.004 < K+K- Invariant Mass (GeV/c2) < 1.04
    • Kinematic Fit: 4-momentum conservation: p missing mass
  • Confidence Level
    • NOTE: The pulls had sigmas of ~1.5 - 1.6, and the p_z means were +/- 0.2 (other means were 0). This is possibly due to my having an incorrect variance for the photon energy, and combinatoric background seeping into the distributions.
    • NOTE: the spike at zero for these distributions is way above the top of the plots.
Fit Constraint Y(2175) f1(1285) bggen
(p)
Mattione Update 07092012 KinFit ConfidenceLevel Y2175.png
Mattione Update 07092012 KinFit ConfidenceLevel Y2175 f11285.png
Mattione Update 07092012 KinFit ConfidenceLevel Y2175 Pythia.png


Final Mass Peaks

  • Final Analysis Step:
    • Require that the confidence level from the kinematic fit be > 1%
  • Final Mass Peaks
    • NOTE: proton peak uses pre-kinfit track momentum, Y(2175) peak uses post-kinfit track momentum
Mass Peak Y(2175) f1(1285) bggen
p
Mattione Update 07092012 FinalMass Proton Y2175.png
Mattione Update 07092012 FinalMass Proton Y2175 f11285.png
Mattione Update 07092012 FinalMass Proton Y2175 Pythia.png
Y(2175)
Mattione Update 07092012 FinalMass Y2175 Y2175.png
Mattione Update 07092012 FinalMass Y2175 Y2175 f11285.png
Mattione Update 07092012 FinalMass Y2175 Y2175 Pythia.png


Y(2175) Study Statistics

  •  % of events & track combinations that survive cuts and are near the signal peak.
    • NOTE: Final column is "rough" because I assumed that the track combination / event ratio is mass-independent (I just multiplied columns 2 & 4)
Reaction # Generated Events  % Events Survive Cuts # Surviving Track Combos / Surviving Event  % Surviving Track Combos within +/- 2Γ (84.4%) of Y(2175) mass peak Rough % Generated Events within +/- 2Γ (84.4%) of Y(2175) mass peak
Y(2175) 323196 7.4% 1.17 73.8% 5.5%
f1(1285) 503125 1.6% 1.13 40.4% 0.65%
bggen 1047972 0.044% 1.31 27.8% 0.012%


φ3(1850) Study Overview

Reaction

  • γ p → φ3(1850), p
    • φ3(1850) → K+, K-
  • Final State: p, K+, K-
  • Events generated using genr8 with: 9 GeV Photons, Γφ3(1850) = 87 MeV/c2, t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0

Background Channel

  • γ p → f0(980), p
    • f0(980) → π+, π-
  • Final State: p, π+, π-
  • Events generated using genr8 with: 9 GeV Photons, Γf0(980) = 50 MeV/c2, t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0

bggen

  • Generated entire photon energy region

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!)
  • 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 reconstruction of 1-to-2 q+ Tracks, 1 q- Track (proton is treated as missing)
    • Required 45.0 < Track-Vertex-Z (cm) < 85.0
    • Required DOCA between tracks < 5.0 cm
    • Require the combined FOM for PID (K+, K-) be > 1%
    • Place very loose cuts on the p missing mass (0.3 - 1.6): reduces # of bogus track combinations to save time / cleanup histograms
    • Kinematic Fit: 4-momentum conservation: p missing mass
    • Require that the confidence level from the kinematic fit be > 1%

φ3(1850) Study Analysis

  • First Analysis Step:
    • Require reconstruction of 1-to-2 q+ Tracks, 1 q- Track (proton is treated as missing)

Thrown Track Parameters

  • Thrown Track Parameters
    • NOTE: Histogram counts within the f0(980) and bggen sections are not self-consistent (had to cobble together plots).
Track φ3(1850) f0(980) bggen
γ Spike at E = 9.0 GeV Spike at E = 9.0 GeV
Mattione Update 07092012 ThrownP Photon Phi31850 Pythia.png
K+
Mattione Update 07092012 ThrownPVsTheta KPlus Phi31850.png
NA
Mattione Update 07092012 ThrownPVsTheta KPlus Phi31850 Pythia.png
K-
Mattione Update 07092012 ThrownPVsTheta KMinus Phi31850.png
NA
Mattione Update 07092012 ThrownPVsTheta KMinus Phi31850 Pythia.png
π+ NA
Mattione Update 07092012 ThrownPVsTheta PiPlus Phi31850 f0980.png
Mattione Update 07092012 ThrownPVsTheta PiPlus Phi31850 Pythia.png
π- NA
Mattione Update 07092012 ThrownPVsTheta PiMinus Phi31850 f0980.png
Mattione Update 07092012 ThrownPVsTheta PiMinus Phi31850 Pythia.png
p
Mattione Update 07092012 ThrownPVsTheta Proton Phi31850.png
Mattione Update 07092012 ThrownPVsTheta Proton Phi31850 f0980.png
Mattione Update 07092012 ThrownPVsTheta Proton Phi31850 Pythia.png


Initial Mass Peaks

  • Next Analysis Steps:
    • Required 45.0 < Track-Vertex-Z (cm) < 85.0
    • Required DOCA between tracks < 5.0 cm
    • Require the combined FOM for PID (K+, K-) be > 1%
  • Initial Mass Peaks
    • Note: The peak in the f1(1285) φ-mass plot is due to my forcing the f1(1285) to decay to ηη, with each η decaying to π+π-.
Mass Peak φ3(1850) f0(980) bggen
p
Mattione Update 07092012 Mass Proton Phi31850.png
Mattione Update 07092012 Mass Proton Phi31850 f0980.png
Mattione Update 07092012 Mass Proton Phi31850 Pythia.png
φ3(1850)
Mattione Update 07092012 Mass Phi31850 Phi31850.png
Mattione Update 07092012 Mass Phi31850 Phi31850 f0980.png
Mattione Update 07092012 Mass Phi31850 Phi31850 Pythia.png


Kinematic Fitting

  • Next Analysis Steps:
    • Place very loose cut on the p missing mass (0.3 - 1.6): reduces # of bogus track combinations to save time / cleanup histograms
    • Kinematic Fit: 4-momentum conservation: p missing mass
  • Confidence Level
    • NOTE: The pulls had sigmas of ~1.14 for φ3(1850), ~0.94 for f0(980), and p_z means of +/- 0.2 (bggen pulls were OK). This is possibly due to my having an incorrect variance for the photon energy, and combinatoric background.
    • NOTE: the spike at zero for these distributions is way above the top of the plots.
Fit Constraint φ3(1850) f0(980) bggen
(p)
Mattione Update 07092012 KinFit ConfidenceLevel Phi31850.png
Mattione Update 07092012 KinFit ConfidenceLevel Phi31850 f0980.png
Mattione Update 07092012 KinFit ConfidenceLevel Phi31850 Pythia.png


Final Mass Peaks

  • Final Analysis Step:
    • Require that the confidence level from the kinematic fit be > 1%
  • Final Mass Peaks
    • NOTE: proton peak uses pre-kinfit track momentum, φ3(1850) peak uses post-kinfit track momentum
Mass Peak φ3(1850) f0(980) bggen
p
Mattione Update 07092012 FinalMass Proton Phi31850.png
Mattione Update 07092012 FinalMass Proton Phi31850 f0980.png
Mattione Update 07092012 FinalMass Proton Phi31850 Pythia.png
φ3(1850)
Mattione Update 07092012 FinalMass Phi31850 Phi31850.png
Mattione Update 07092012 FinalMass Phi31850 Phi31850 f0980.png
Mattione Update 07092012 FinalMass Phi31850 Phi31850 Pythia.png


φ3(1850) Study Statistics

  •  % of events & track combinations that survive cuts and are near the signal peak.
    • NOTE: Final column is "rough" because I assumed that the track combination / event ratio is mass-independent (I just multiplied columns 2 & 4)
Reaction # Generated Events  % Events Survive Cuts # Surviving Track Combos / Surviving Event  % Surviving Track Combos within +/- 2Γ (84.4%) of φ3(1850) mass peak Rough % Generated Events within +/- 2Γ (84.4%) of φ3(1850) mass peak
φ3(1850) 992409 11.5% 1.04 75.4% 8.7%
f0(980) 513254 25.2% 1.02 9.5% 2.4%
bggen 1165735 0.56% 1.02 9.1% 0.051%


Upcoming Kaon Channels

γ p → η'(2300), p

  • η'(2300) → K*(892)0, K0_bar: 50%
    • K*(892)0 → K+, π-: 66.5%
      • K0_bar → π+, π-: 69.2%
  • Branching Fraction: 23.0%
  • Final State: p, K+, π-, π+, π-

Proposal Had:

  • η'(2300) → K*(892)+, K-: 50%
    • K*(892)+ → K+, π0: 33.3%
      • π0 → γ, γ: 98.8%
  • Branching Fraction: 16.5%
  • Final State: p, K-, K+, γ, γ

γ p → h'2(2600), p

  • h'2(2600) → K1(1400)+, K-: 50%
    • K1(1400)+ → K*(892)0, π+: 63%
      • K*(892)0 → K+, π-: 66.5%
  • Branching Fraction: 21%
  • Final State: p, K-, π+, K+, π-