Search for the Decay K_L to π⁰ μ^+ μ^-

A. Alavi-Harati , et al (KTeV collaboration)

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classification ✦ hep-ex

keywords decayeventsexpectedklpimumusearchbackgroundcarriedconfidence

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We report on a search for the decay \klpimumu 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 CKM mechanism for CP violation or point to new physics. Two events were observed in the 1997 data with an expected background of $0.87 \pm 0.15$ events, and we set an upper limit \BR{\klpimumu} $ <3.8 \times 10^{-10}$ at the 90% confidence level.

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