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A measurement of the decay rate for the process kaon(L) going to positive muon negative muon
Kenney, Christopher John
Kenney, Christopher John
Abstract
A sample of 87 events of the GIM suppressed decay K$\sb{\rm L} \to \mu\sp+\mu\sp-$ were observed in an experiment performed in 1988 at the Brookhaven National Laboratory. Concurrently, 8,887 examples of the CP-violating decay K$\sb{\rm L} \to \pi\sp+\pi\sp-$ were also seen. The apparatus consisted of a double-magnet spectrometer as well as electromagnetic and muon detector systems. From the previously measured branching ratio for K$\sb{\rm L} \to \pi\sp+\pi\sp-$ and the different instrumental acceptances of the detector for the two decays, the data sample was normalized to the effective number of K$\sb{\rm L}$ decays observed. A value for the ratio (K$\sb{\rm L} \to \mu\sp+\mu\sp-)$/(K$\sb{\rm L} \to$ anything) of (5.7 $\pm$ 0.6(stat.) $\pm$ 0.3(syst.)) $\times$ 10$\sp{-9}$ was obtained.
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1989
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9022043.pdf
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Physics
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https://dx.doi.org/doi:10.21220/s2-dv7n-cj19