Phys. Rev. Lett. 84, 5279–5282 (2000)Search for the Decay KL→π0μ+μ-Received 23 December 1999; published in the issue dated 5 June 2000 We report on a search for the decay KL→π0μ+μ- carried out as a part of the KTeV experiment at Fermilab. This decay is expected to have a significant CP violating contribution and a direct measurement will either support the Cabibbo-Kobayashi-Maskawa mechanism for CP violation or point to new physics. Two events were observed in the 1997 data with an expected background of 0.87±0.15 events, and we set an upper limit B(KL→π0μ+μ-)<3.8×10-10 at the 90% confidence level. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.5279
DOI:
10.1103/PhysRevLett.84.5279
PACS:
13.20.Eb, 11.30.Er, 14.40.Aq
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