Phys. Rev. Lett. 84, 1389–1392 (2000)Improved Branching Ratio Measurement for the Decay KL0→μ+μ-Received 24 August 1999; published in the issue dated 14 February 2000 We report results from Experiment 871, performed at the BNL AGS, of a measurement of the branching ratio KL0→μ+μ- with respect to the CP-violating mode KL0→π+π-. This experiment detected over 6200 candidate μ+μ- events, a factor of 6 more than that seen in all previous measurements combined. The resulting branching ratio Γ(KL0→μ+μ-)/Γ(KL0→π+π-) = (3.474±0.057)×10-6 leads to a branching fraction B(KL0→μ+μ-) = (7.18±0.17)×10-9, which is consistent with the current world average, and reduces the uncertainty in this decay mode by a factor of 3. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.1389
DOI:
10.1103/PhysRevLett.84.1389
PACS:
13.20.Eb, 12.15.Hh, 12.15.Mm
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