Observation of the Decay $K_L\to μ^+μ^- γγ$

Details Observation of the Decay $K_L\to μ^+μ^- γγ$ Observation of the Decay $K_L\to μ^+μ^- γγ$

2000-01-04

arxiv.org/abs/hep-ex/0001005v1

Phys.Rev.D62:112001,2000

Physics

High Energy Physics

High Energy Physics - Experiment

See also the paper "Search for the Decay $K_L \to \pi^0 \mu^+ \mu^-$", also by the KTeV collaboration

Scientific paper

10.1103/PhysRevD.62.112001

We have observed the decay $K_L\to \mu^+\mu^- \gamma \gamma$ at the KTeV experiment at Fermilab. This decay presents a formidable background to the search for new physics in $K_L\to\pi^0\mu^+\mu^-$. The 1997 data yielded a sample of 4 signal events, with an expected background of 0.155 $\pm$ 0.081 events. The branching ratio is ${\mathcal B}(K_L\to \mu^+\mu^- \gamma \gamma$) $ = (10.4^{+7.5}_{-5.9} {\rm (stat)} \pm 0.7 {\rm (sys)})\times 10^{-9}$ with $m_{\gamma\gamma} \geq 1 {\rm MeV/c}^2$, consistent with a QED calculation which predicts $(9.1\pm 0.8)\times 10^{-9}$.

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