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Title: Study of the K0L →π⁰π⁰νν¯decay

The rare decay K0L→π⁰π⁰νν̄ was studied with the E391a detector at the KEK 12-GeV proton synchrotron. Based on 9.4×10⁹ K0L decays, an upper limit of 8.1×10⁻⁷ was obtained for the branching fraction at 90% confidence level. We also set a limit on the K0L→π⁰π⁰X (X→invisible particles) process; the limit on the branching fraction varied from 7.0×10⁻⁷ to 4.0×10⁻⁵ for the mass of X ranging from 50 MeV/c² to 200 MeV/c².
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Publication Date:
OSTI Identifier:
1100814
Type:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 84; Journal Issue: 5; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English