Abstract
We present a measurement of , 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 decays in flight; the measurement is based on thousand decays. We normalize to decays. We find . Using the Mikaelian and Smith prediction for the mass spectrum, we correct the result to the full mass range. The corrected result is . This result is consistent with previous measurements, and the uncertainty is a factor of 3 smaller than any previous measurement.
- Received 6 February 2019
DOI:https://doi.org/10.1103/PhysRevD.100.032003
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society