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The KTeV experiment at Fermilab has isolated a total of 132 events from therare decay KL->e+e-mu+mu-, with an estimated background of 0.8 events. Thebranching 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 firstmeasurement 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 thelimited statistics, no sensitivity is found to the DIP parameter beta. Themagnitude 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 beconsistent with zero. We set a 90% C.L. upper limit of 4.12 x 10^(-11) on thebranching ratio of the lepton flavor--violating mode KL->e+-e+-mu+-mu+-, afactor of three improvement over the current limit from the KTeV experiment.Comment: 4 pages, 5 figures, LaTex, submitted to Physical Review Letter

physical review letters

Measurements of the Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>K</mml:mi><mml:mi>L</mml:mi></mml:msub><mml:mo>→</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>μ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>

Measurements of the DecayKL→e+e−μ+μ−