Measurement of the Branching Ratio of $$K_L \to e^+e^- \gamma\gamma$$
- Osaka U.
This thesis presents new measurement of the $$K_L \to e^+e^- \gamma\gamma$$ branching ratio in Fermilab experiment E799. The decay $$K_L \to e^+e^- \gamma\gamma$$ is dominated by a $$K_L$$ Dalitz decay, $$K_L \to e^+e^- \gamma$$, with an internal bremsstrahlung photon. In addition, the decay $$K_L \to e^+e^- \gamma\gamma$$ has a small fraction from the direct emission process. This decay is important in order to understand the long distance physics, such as the $$K_L \to \gamma\gamma^*$$ form factor and the $$K_L \to \gamma\gamma\gamma^*$$ direct emission process. This decay mode also has been a focus on general attention as the most serious background to the CP violating decay $$K_L \to \pi^0 e^+e^-$$. We observed 58 $$K_L \to e^+e^- \gamma\gamma$$ events, and measured the branching ratio to be:...
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1422819
- Report Number(s):
- FERMILAB-THESIS-1995-68; 413234
- Country of Publication:
- United States
- Language:
- English
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