Phys. Rev. Lett. 86, 397–401 (2001)Search for the Decay KL→π0e+e-Received 11 September 2000; published in the issue dated 15 January 2001 We report on a search for the decay KL→π0e+e- carried out by the KTeV/E799 experiment at Fermilab. This decay is expected to have a significant CP violating contribution and the measurement of its branching ratio could support the Cabibbo-Kobayashi-Maskawa mechanism for CP violation or could point to new physics. Two events were observed in the 1997 data with an expected background of 1.06±0.41 events, and we set an upper limit B(KL→π0e+e-)<5.1×10-10 at the 90% confidence level. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.397
DOI:
10.1103/PhysRevLett.86.397
PACS:
13.20.Eb, 11.30.Er, 14.40.Aq
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