Search for the Decay $$K_L \to \pi^0 \nu\overline{\nu}$$
- Osaka U.
This thesis describes a search for $$K_L \to \pi^0 \nu\overline{\nu}$$ decay, carried out as a part of E799-II experiment at Fermilab. Within the Standard Model, the $$K_L \to \pi^0 \nu\overline{\nu}$$ decay is dominated by the direct CP violating processes, and thus a discovery of the decay implies confirmation of the direct CP violation. Due to theoretically clean calculations, a measurement of Br($$K_L \to \pi^0 \nu\overline{\nu}$$) is one of the best ways to determine the CKM parameter, and is one of the most sensitive probes for a new physics. No such events were observed, and we set an upper limit Br($$K_L \to \pi^0 \nu\overline{\nu}$$) < 5.9 x $$10^{-7}$$ ; at the 90% confidence level. This result represents an improvement of a factor of 98 over the current limit listed by Particle Data Group, and of a factor of 3 over the recent preliminary result.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1421524
- Report Number(s):
- FERMILAB-THESIS-1998-46; 488150
- Country of Publication:
- United States
- Language:
- English
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