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KTeV KL->e e gamma plots

Updated August 9, 2007.

[KL->eeg Results]

Plots in Phys. Rev. Lett. 99, 051804 (2007)

• trdcut.eps, trdcut.pdf
  Fig. 1: The reconstructed e⁺e^-gamma mass distribution before and after the TRD cut shows a significant decrease in the amount of backgroudn while retaining most of the signal. The signal region is indicated by the two vertical lines centered on the kaon mass.
  
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• bms_cv.eps, bms_cv.pdf
  Fig. 2: The variation in the shape of the e⁺e^- mass distribution was used to determine the values of the form factor parameters. Three comparisons between data (dots) and Monte Carlo samples (histogram) with different values of C_{alpha K}* are shown as well sas the final fit to the shape chi² values.
  
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• akstar_comparison.eps, akstar_comparison.pdf
  Fig. 3: The grpah shows a comparison of our measurement of C_{alpha K}* with previous measurements. The outer error bars represent the total uncertainty and the inner error bars are the statistical uncertainty only (where applicable).
  
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Plots shown at DPF2002 by Jason Ladue

• dpf2002.ps
  Transparencies
  
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• backtrd.eps
  eeg mass distribution before (purple) and after (yellow) TRD cut
  
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• backfit.eps
  eeg mass distribution with background extrapolation
  
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• ephotrat.eps
  Energy of photon for KL->eeg (left) and the normalization mode, KL->pi0 pi0 pi0Dalitz (right)
  
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• etotrat.eps
  Total energy for KL->eeg (left) and the normalization mode, KL->pi0 pi0 pi0Dalitz (right)
  
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• trkseprat.eps
  Separation between tracks at the first drift chamber for KL->eeg (left) and the normalization mode, KL->pi0 pi0 pi0Dalitz (right).
  
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• vtxchirat.eps
  Vertex chisquare distributions for KL->eeg (left) and the normalization mode, KL->pi0 pi0 pi0Dalitz (right).
  
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• zvtxrat.eps
  Decay vertex distributions for KL->eeg (left) and the normalization mode, KL->pi0 pi0 pi0Dalitz (right).
  
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• brworld.eps
  Comparison of KL->eeg branching ratios between experiments
  
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• meeratmcmany.eps
  ee invariant mass distribution comparisons between data and MC with different alpha K*. Alpha K* = +0.20 (top left), 0.00 (top right), -0.16 (bottom left), and -0.36 (bottom right).
  
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• meeratbest.eps
  ee invariant mass distribution (top) and the data/MC ratio (bottom)
  
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• akworld.eps
  alpha K* measurements for NA48 eeg, KTeV eeg and mmg
  
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Send corrections to Taku Yamanaka.