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KTeV KL->pi pi e e plots

Updated August 8, 2005.

[KL->pi pi ee Results]

Plots from [PRL96 (2006)] [DPF2002] [PRL84 (2000)] [PRL80 (1998)]

[top] PRL96 (2006) [DPF2002] [PRL84 (2000)] [PRL80 (1998)]

Plots in Phys. Rev. Lett. 96, 101801 (2006)

ppee_mass_asym_gray.eps, ppee_mass_asym_gray.pdf
FIG.1. M_pi+pi-e+e- invariant mass for events passing all K_L->pi⁺pi^-e⁺e^- physics cuts. The superimposed K_L mass peaks for sin phi cos phi > 0 (white histogram) and < 0 (gray histogram) directly demonstrate the large CP violating asymmetry. There is no asymmetry in the backgrounds to the two peaks as demonstrated by their complete overlap of the distributions outside the kaon peak region.

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tmp2.eps, tmp2.pdf
FIG.2.a) Likelihood fit to the independent variable sin phi cos phi

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tmp3.eps, tmp3.pdf
FIG.2.b) Likelihood fit to the independent variable M_{pi+ pi-}

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31.eps, 31.pdf
FIG.2.c) Likelihood fit to the independent variable M_{e+ e-} (the dotted curve in the insert in this figure shows the deficit of e⁺e^- pairs at high M_ee if the charge radius process is ignored. The chi²/dof for the fit of the model to the data increases from 0.85 to 1.6 if the charge radius process is left out.)

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tmp5.eps, tmp5.pdf
Likelihood fit to the independent variable theta_pi+

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tmp6.eps, tmp6.pdf
Likelihood fit to the independent variable theta_e+

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tmp7.eps, tmp7.pdf
Likelihood fit to the E_gamma* defined as E_e+ + E_e-

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[top] [PRL96 (2006)] DPF2002 [PRL84 (2000)] [PRL80 (1998)]

Plots shown at DPF2002 by Alexandar Golossanov (May 2002)

Transparencies of the the talk (PDF)

contour.eps
Contour plot of the log Likelihood.

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contour_plain.eps
Contour plot of the log Likelihood.

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dom_Mee.eps
M_ee. Crosses show data, and histogram shows MC.

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dom_Mee_logy.eps
M_ee in semi-log scale. Crosses show data, and histogram shows MC.

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dom_Mpp.eps
M_{pi pi} distribution.

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dom_cel.eps
cos theta_e distribution. Crosses show data, and the histogram shows MC.

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dom_cpi.eps
cos theta_pi distribution. Crosses show data, and the histogram show MC.

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dom_phi.eps
phi distribution. Crosses show data, and the histogram shows MC.

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dom_scphi.eps
sin(phi)cos(phi) distribution. Crosses show data, and the histogram shows MC.

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mpeak.eps
pi pi e e invariant mass distrubution.

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p0kin.eps
pp0kine variable distribution.

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[top] [PRL96 (2006)] [DPF2002] PRL84 (2000) [PRL80 (1998)]

Plots in Phys. Rev. Lett. 84, 408 (2000)

mass.eps4
M_pipiee invariant mass for events passing cuts.

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fig5_prl.eps2
a) Observed phi and b) sin(phi)cos(phi) angular distributions: The data are shown as dots. The histogram is a Monte Carlo simulation based on the model of Ref.[3].

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amplitudes_10.eps
Processes contributing to K_L->pi⁺pi^-e⁺e^-.
a) CP-violating bremsstrahlung
b) CP-conserving M1 gamma emission
c) CP-violating E1 gamma emission
d) Charge radius process

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likelihood_final.eps4
a) E^*_gamma spectrum of data (dots), Monte Carlo using a constant |g_M1| (dashed histogram), Monte Carlo with E^*_gamma dependent form factor (solid histogram);
b) Likelihood contours of a₁/a₂ and |g_M1|; Constant asymmetry contours calculated from the data as described in the text are superimposed.

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[top] [PRL96 (2006)] [DPF2002] [PRL84 (2000)] PRL80 (1998)

Plots in Phys. Rev. Lett. 80, 4123 (1998)

799det.eps
Fig.1. The KTeV (E799-II) detector

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finfig2.eps
Fig.2. P²_pi0 for K_L->pi⁺pi^-e⁺e^- event candidates from the data (solid dots). The solid line is the predicted distribution from a Monte Carlo simulation of K_L->pi⁺pi^-pi⁰_D events and the dotted line is the predicted distribution from a Monte Carlo simulation of K_L->pi⁺pi^-e⁺e^- using the model of [1]. The K_L->pi⁺pi^-pi⁰_D Monte Carlo is normalized to the flux of decaying K_L from the data sample (see text). The K_L->pi⁺pi^-e⁺e^- Monte Carlo is arbitrarily normalized. The arrow shows the cut value of -0.0025 GeV²/c².

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finfig3.eps
Fig.3. (a) The P²_T vs the M_pipiee distribution for data.
(b) The M_pipiee distribution for events with P²_T <= 0.0002 GeV²/c².

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finfig4.eps
Fig.4. (a) The pi⁺pi^- invariant mass distributions for K_L->pi⁺pi^-e⁺e^- using the model cited in Ref.[1] (solid curve) and phase space (constant matrix element) (dashed curve).
(b) The pi⁺pi^- invariant mass distributions for K_L->pi⁺pi^-e⁺e^- after acceptance using teh model cited in Ref.[1] (solid curve) and phase space (sashed curve). The final event candidates are overlaid after background subtraction.

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