KTeV KL > mu mu gamma plots
Updated July 7, 2002.
[KL>mu mu gamma Results]
"Measurement of the Branching Ratio and Form Factor of K_{L} >
mu^{+}mu^{}gamma"

figure1.eps
Fig.1. Muon detection efficiency vs. track momentum (top left), data to Monte Carlo ratio of muon efficiency (top right), and multiple scattering width vs. track momentum (bottom). Widths are those of Gaussian fits to the difference between extrapolated track position and hit counter position.


figure2.eps
Fig.2. The reconstructed m_{mu+ mu gamma} distribution after final cuts. The large peak centered at 380 MeV/c^{2} is from K_{L}> pi+ pi pi0. K_{mu3} dominates the background from ~400 MeV/c^{2} out to 600 MeV/c^{2} with a slight enhancement at 450 MeV/c^{2} from K_{mu3 gamma}.


figure3.eps
The dimuon mass distributions for data and for Monte Carlo with no form factor (top). The data/Monte Carlo ratio is a direct measurement of the form factor (bottom). The Monte Carlo is normalized to the total number of data events.


figure4.eps
Loglikelihood fits to the BMS parameter alpha_{K*} (left), and to teh DIP parameter alpha (right).


figure5.eps
Comparison of the alpha_{K*} measurement with previous experiments. The PDG value measurements from teh BNL845 and NA31 experiments.

Send corrections to Taku Yamanaka