Determination of the parity of the neutral pion via its four-electron decay

E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, E. Blucher, G. J. Bock, E. Cheu, R. Coleman, M. D. Corcoran, B. Cox, A. R. Erwin, C. O. Escobar, A. Glazov, A. Golossanov, R. A. Gomes, P. Gouffon, Y. B. Hsiung, D. A. Jensen, R. Kessler, K. KoteraA. Ledovskoy, P. L. McBride, E. Monnier, H. Nguyen, R. Niclasen, D. G. Phillips, E. J. Ramberg, R. E. Ray, M. Ronquest, E. Santos, W. Slater, D. Smith, N. Solomey, E. C. Swallow, P. A. Toale, R. Tschirhart, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. J. Wilking, B. Winstein, R. Winston, E. T. Worcester, T. Yamanaka, E. D. Zimmerman, R. F. Zukanovich

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34 Scopus citations


We present a new determination of the parity of the neutral pion via the double Dalitz decay π0→e+e-e+e-. Our sample, which consists of 30511 candidate decays, was collected from KL→π0π0π0 decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative π0 parity and place a limit on scalar contributions to the π0→e+e-e+e- decay amplitude of less than 3.3% assuming CPT conservation. The π0γ*γ* form factor is well described by a momentum-dependent model with a slope parameter fit to the final state phase-space distribution. Additionally, we have measured the branching ratio of this mode to be B(π0→e+e-e+e-)=(3.26±0.18)×10-5.

Original languageEnglish (US)
Article number182001
JournalPhysical review letters
Issue number18
StatePublished - May 6 2008

ASJC Scopus subject areas

  • General Physics and Astronomy


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