Phys. Rev. D 64, 012003 (2001) [4 pages]Measurement of the branching ratio of KL→e+e-γγReceived 23 October 2000; published 30 May 2001 We report on a study of the decay KL→e+e-γγ 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±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,Eγ*>5MeV)=(5.84±0.15(stat)±0.32(syst))×10-7. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.64.012003
DOI:
10.1103/PhysRevD.64.012003
PACS:
13.20.Eb, 11.30.Er, 13.40.Hq, 14.40.Aq
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