Phys. Rev. D 77, 112004 (2008) [8 pages]Final results from the KTeV experiment on the decay KL→π0γγReceived 28 April 2008; published 18 June 2008 We report on a new measurement of the branching ratio B(KL→π0γγ) using the KTeV detector. We reconstruct 1982 events with an estimated background of 608, that results in B(KL→π0γγ)=(1.29±0.03stat±0.05syst)×10-6. We also measure the parameter, aV, which characterizes the strength of vector meson exchange terms in this decay. We find aV=-0.31±0.05stat±0.07syst. These results utilize the full KTeV data set collected from 1997 to 2000 and supersede earlier KTeV measurements of the branching ratio and aV. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.77.112004
DOI:
10.1103/PhysRevD.77.112004
PACS:
13.20.Eb, 11.30.Er, 12.39.Fe, 13.40.Gp
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