Measurement of the branching ratio of K L →e + e - γγ
Journal
Physical Review D
Journal Volume
64
Journal Issue
1
Date Issued
2001
Author(s)
Alavi-Harati, A. et al.
Abstract
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.
Type
journal article