Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-12-02
Phys.Rev.Lett.90:141801,2003
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 5 figures, LaTex, submitted to Physical Review Letters
Scientific paper
10.1103/PhysRevLett.90.141801
The KTeV experiment at Fermilab has isolated a total of 132 events from the rare decay KL->e+e-mu+mu-, with an estimated background of 0.8 events. The branching ratio of this mode is determined to be 2.69 +/- 0.24 (stat) +/- 0.12 (syst) x 10^-9, with a radiative cutoff of M(eemm)^2/M(K)^2 > 0.95. The first measurement using this mode of the parameter alpha from the D'Ambrosio, Isidori, and Portoles model of the KLg*g* vertex yields a result of -1.59 +/- 0.37, consistent with values obtained from other decay modes. Because of the limited statistics, no sensitivity is found to the DIP parameter beta. The magnitude of the angular distribution asymmetry between the e+e- and mu+mu- planes, indicative of a CP-violating contribution to the decay, is found to be consistent with zero. We set a 90% C.L. upper limit of 4.12 x 10^(-11) on the branching ratio of the lepton flavor--violating mode KL->e+-e+-mu+-mu+-, a factor of three improvement over the current limit from the KTeV experiment.
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