A Measurement of the Branching Ratio of $K_L \to e^+e^-γγ$

Details A Measurement of the Branching Ratio of $K_L \to e^+e^-γγ$ A Measurement of the Branching Ratio of $K_L \to e^+e^-γγ$

2000-10-23

arxiv.org/abs/hep-ex/0010059v1

Phys.Rev.D64:012003,2001

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 4 figures

Scientific paper

10.1103/PhysRevD.64.012003

We report on a study of the decay $K_L \to e^+e^-\gamma\gamma$ carried out as a part of the KTeV/E799 experiment at Fermilab. The 1997 data yielded a sample of 1543 events, including an expected background of $56 \pm 8$ events. An effective form factor was determined from the observed distribution of the $e^+e^-$ invariant mass. Using this form factor in the calculation of the detector acceptance, the branching ratio was measured to be ${\mathcal B}(K_L \to e^+ e^- \gamma \gamma, E^*_\gamma > 5 {MeV}) = (5.84 \pm 0.15 {\rm ~(stat)} \pm 0.32 {\rm ~(sys)})\times 10^{-7}$.

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