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Item Measurement of the branching ratio of π0 Dalitz decay using KL → π0π0π0 decays(2019) Abouzaid, Erin Elizabeth; Arenton, Michael; Barker, A. R.; Bellantoni, Leo; Blucher, Edward; Bock, Gregory J.; Cheu, Elliott; Coleman, R.; Corcoran, M. D.; Cox, Brad; Gomes, Ricardo AvelinoWe present a measurement of Bðπ0 → eþe−γÞ=Bðπ0 → γγÞ, the Dalitz branching ratio, using data taken in 1999 by the E832 KTeV experiment at Fermi National Accelerator Laboratory. We use neutral pions from fully reconstructed KL decays in flight; the measurement is based on ∼60 thousand KL → π0π0π0 → γγγγeþe−γ decays. We normalize to KL → π0π0π0 → 6γ decays. We find Bðπ0 → eþe−γÞ=Bðπ0 → γγÞ ðmeþe− > 15 MeV=c2Þ¼½3.920 0.016ðstatÞ 0.036ðsystÞ × 10−3. Using the Mikaelian and Smith prediction for the eþe− mass spectrum, we correct the result to the full eþe− mass range. The corrected result is Bðπ0 → eþe−γÞ=Bðπ0 → γγÞ¼½1.1559 0.0047ðstatÞ 0.0106ðsystÞ %. This result is consistent with previous measurements, and the uncertainty is a factor of 3 smaller than any previous measurement.