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

Abstract

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

10 pages of text, 4 figures in separate files

References in corpus (1)

• Rare and Radiative Kaon Decays

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