- Two events with the characteristics of the decay KL0 →e+e-e+e- have been observed with a negligible expected background from which a branching ratio of (4 ± 3) X 10-8 is derived. This result is consistent with values estimated from theoretical models based on the double internal conventional of the decay KL0 →γγ.
- Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
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