Difference between revisions of "Mattione Update 07092012"

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(→‎Thrown Track Parameters)
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|-
 
|-
 
! K<sup>+</sup>
 
! K<sup>+</sup>
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| [[Image:Mattione_Update_07092012_ThrownPVsTheta_KPlus_Y2175.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_KPlus_Y2175_f11285.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_KPlus_Y2175_Pythia.png|left|350px]]
+
| [[Image:Mattione_Update_06252012_ThrownPVsTheta_KPlus.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_KPlus_Y2175_f11285.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_KPlus_Y2175_Pythia.png|left|350px]]
 
|-
 
|-
 
! K<sup>-</sup>
 
! K<sup>-</sup>
−
| [[Image:Mattione_Update_07092012_ThrownPVsTheta_KMinus_Y2175.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_KMinus_Y2175_f11285.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_KMinus_Y2175_Pythia.png|left|350px]]
+
| [[Image:Mattione_Update_06252012_ThrownPVsTheta_KMinus.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_KMinus_Y2175_f11285.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_KMinus_Y2175_Pythia.png|left|350px]]
 
|-
 
|-
 
! &pi;<sup>+</sup>
 
! &pi;<sup>+</sup>
−
| [[Image:Mattione_Update_07092012_ThrownPVsTheta_PiPlus_Y2175.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_PiPlus_Y2175_f11285.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_PiPlus_Y2175_Pythia.png|left|350px]]
+
| [[Image:Mattione_Update_06252012_ThrownPVsTheta_PiPlus.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_PiPlus_Y2175_f11285.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_PiPlus_Y2175_Pythia.png|left|350px]]
 
|-
 
|-
 
! &pi;<sup>-</sup>
 
! &pi;<sup>-</sup>
−
| [[Image:Mattione_Update_07092012_ThrownPVsTheta_PiMinus_Y2175.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_PiMinus_Y2175_f11285.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_PiMinus_Y2175_Pythia.png|left|350px]]
+
| [[Image:Mattione_Update_06252012_ThrownPVsTheta_PiMinus.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_PiMinus_Y2175_f11285.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_PiMinus_Y2175_Pythia.png|left|350px]]
 
|-
 
|-
 
! p
 
! p
−
| [[Image:Mattione_Update_07092012_ThrownPVsTheta_Proton_Y2175.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_Proton_Y2175_f11285.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_Proton_Y2175_Pythia.png|left|350px]]
+
| [[Image:Mattione_Update_06252012_ThrownPVsTheta_Proton.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_Proton_Y2175_f11285.png|left|350px]] || [[Image:Mattione_Update_07092012_ThrownPVsTheta_Proton_Y2175_Pythia.png|left|350px]]
 
|}
 
|}
 
<br style="clear:both;"/>
 
<br style="clear:both;"/>

Revision as of 21:23, 8 July 2012

Y(2175) Study

Reaction

  • γ p → Y(2175), p
    • Y(2175) → π+, π-, φ
      • φ → K+, K-
  • Final State: p, π+, π-, K+, K-
  • ~530,000 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-
  • ~530,000 Events Generated using genr8 with: 9 GeV Photons, Γf1(1285) = 24 MeV/c2, t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0

Pythia

  • 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-to-3 + Tracks, 2 - Tracks (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 (π+, π-, K+, K-) be > 1%
    • Place very loose cuts on the φ invariant mass (0.8 - 1.3) and p missing mass (0.5 - 1.4): 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%

Thrown Track Parameters

  • Thrown Track Parameters
Track Y(2175) f1(1285) Pythia
γ
350px
350px
Mattione Update 07092012 ThrownP Photon Y2175 Pythia.png
K+
Mattione Update 06252012 ThrownPVsTheta KPlus.png
350px
Mattione Update 07092012 ThrownPVsTheta KPlus Y2175 Pythia.png
K-
Mattione Update 06252012 ThrownPVsTheta KMinus.png
350px
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

  • Initial Mass Peaks
Mass Peak Y(2175) f1(1285) Pythia
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

  • Confidence Level
Fit Constraint Y(2175) f1(1285) Pythia
(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 Mass Peaks
    • NOTE: proton peak uses pre-kinfit track momentum, Y(2175) peak uses post-kinfit track momentum
Mass Peak Y(2175) f1(1285) Pythia
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


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