We report on a study of the decay KL→e+e-γγcarried 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±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 B(KL→e+e-γγ,E γ*>5 MeV) = (5.84±0.15 (stat) ±0.32 (syst)) ×10-7.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Aug 29 2001|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)