A Measurement of the Branching Ratio of $K_L\to e^{+}{e}^{-}\gamma \gamma$

Abstract

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 $\mathcal{B}(K_L\to e^{+}{e}^{-}\gamma \gamma ,E_{\gamma }^{\ast }>5MeV)=(5.84\pm 0.15(\mathrm{stat})\pm 0.32(\mathrm{sys}))\times 10^{-7}$.

5 pages, 4 figures

References in corpus (1)

• Search for the Decay Kl -> pi0 e+ e-

Cited by in corpus (4)

• Kaon Decays in the Standard Model
• Search for the Rare Decay KL --> pi0 ee
• Measurements of the Decay $K_L\to e^{+}{e}^{-}\gamma$
• New Physics Searches at Kaon and Hyperon Factories