KTeV KL > pi0 nu nubar plots
Updated July 10, 2002.
[KL>pi0 nu nubar Results]
Plots from
[PRD61 (2000)]
[PLB 447 (1999)]
"Search for the Decay K_{L} >
pi^{0}nu nubar Using pi^{0}> e^{+}e^{} gamma"

fig1.eps
The KTeV detector configuration for E799II.


fig2.eps
The P_{T} vs $z$ before the P_{T} cut. The location of the vacuum window is $z$ = 159~m.


fig3.eps
The final P_{T} distribution. The dots represent data, and open histogram is for MC expectation. Two main background contributions are overlaid. Also shown is the signal distribution predicted from the MC whose normalization is arbitrary.


fig4.eps
The number of events around masked region. The left(bold) numbers represent data and the right(italic) is MC expectation.

"Search for the Decay K_{L}> pi^{0} nu nubar"

ktev_det.eps
Plan view of the KTeV detector as configured for this data set.


pt_zvtx_new.eps
The top plot is the P_{T} distribution of the $\pi^0$ from a Monte Carlo simulation of the decay $K_L > \pi^0 \nu \overline{\nu}$. The bottom is the scatter plot of P_{T} $\rm (MeV/c)$ versus the z decay vertex (m) for data after the initial event selection which requires exactly two photons in the final state. The box shows the signal region.


pt_final.eps
The P_{T} distribution with all cuts except for the P_{T} cut. The arrow shows the signal region. The dominant backgrounds from simulations of $K_L$ and $\Lambda$ decays are overlaid on the data. $\Lambda$ events from the target and from $\Xi$ decays are combined. There are no events beyond the P_{T} range in the plot.

Send corrections to Taku Yamanaka