A Measurement of the Branching Ratio and Form Factor of K_L->mu mu gamma

Details A Measurement of the Branching Ratio and Form Factor of K_L->mu mu gamma A Measurement of the Branching Ratio and Form Factor of K_L->mu mu gamma

1995-04-13

arxiv.org/abs/hep-ex/9504005v3

Phys.Rev.Lett.74:3323-3326,1995

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages of text, 4 figures in separate files

Scientific paper

10.1103/PhysRevLett.74.3323

We report on a measurement of the decay $K_L\rightarrow\mu^+\mu^-\gamma$ from Fermilab experiment E799. We observe $207$ candidate signal events with an estimated background of $10.5 \pm 4.0$ events and establish $B(K_L\rightarrow\mu^+\mu^-\gamma) = (3.23\pm 0.23(stat) \pm 0.19(sys))\times 10^{-7}$. This provides the first measurement of the $K\gamma\gamma^*$ form factor in the muonic Dalitz decay mode of the $K_L$.

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