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Phys. Rev. D 47, R2644–R2647 (1993)

Estimation of the branching ratio of the decay KL0→e+e-e+e- from the KL0→e+e-X process

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T. Akagi, R. Fukuhisa,*, Y. Hemmi, T. Inagaki, K. Ishikawa,†, T. Kishida, M. Kobayashi, T. K. Komatsubara,‡, M. Kuze,‡, F. Sai,*, T. Sato, T. Shinkawa, F. Suekane,§, K. Takamatsu, J. Toyoura,**, S. S. Yamamoto,††, and Y. Yoshimura
aDepartment of Physics, Tohoku University, Sendai 980, Japan
bDepartment of Physics, University of Tokyo, Tokyo 113, Japan
cDepartment of Physics, Kyoto University, Kyoto 606, Japan
dNational Laboratory for High Energy Physics, KEK, Tsukuba 305, Japan

Received 24 November 1992; published in the issue dated 1 April 1993

In an experiment to search for the decay KL0→ee using the 12-GeV Proton Synchrotron at KEK, we observed 18 events with the e+e- effective mass greater than 470 MeV/c2. They are presumed to come mainly from the decay KL0→e+e-e+e-. Subtracting the background from the decay KL0→eeγ and the external conversion of γ in the decays KL0→γγ and KL0→eeγ, the branching ratio of the decay KL0→e+e-e+e- is estimated to be (6±2±1)×10-8. It is consistent with the previous experimental values.

© 1993 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.47.R2644
DOI:
10.1103/PhysRevD.47.R2644
PACS:
13.20.Eb

*Present address: Tokyo Res. Lab., IBM Ltd., Tokyo 102, Japan.

†Present address: 2-2-12, Wakamatsuhigashi, Okazaki 444, Japan.

‡Present address: Inst. for Nucl. Study, Univ. of Tokyo, Tanashi 188, Japan.

§Present address: Dept. of Phys., Tohoku Univ., Sendai 980, Japan.

**Present address: Res. Lab., Mitsubishi Elec. Corp. Amagasaki 661, Japan.

††Present address: Fac. of Eng., Kanagawa Univ., Yokohama 221, Japan.

 
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