Measurement of the rare decay pi0 -> e+ e-

Details Measurement of the rare decay pi0 -> e+ e- Measurement of the rare decay pi0 -> e+ e-

2006-10-24

arxiv.org/abs/hep-ex/0610072v1

Phys.Rev.D75:012004,2007

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 4 figures

Scientific paper

10.1103/PhysRevD.75.012004

The branching ratio of the rare decay pi0 -> e+ e- has been measured precisely, using the complete data set from the KTeV E799-II experiment at Fermilab. We observe 794 candidate pi0 -> e+ e- events using K0_L -> 3pi0 as a source of tagged pi0's. The expected background is 52.7 +- 11.2 events, predominantly from high e+ e- mass pi0 -> e+ e- gamma decays. We have measured B[(pi0 -> e+ e-), (m_e+e-/m_pi0)^2 > 0.95] = 6.44 +- 0.25(stat) +- 0.22(syst) x10^(-8), which is above the unitary bound from pi0 -> gamma gamma and within the range of theoretical expectations from the standard model.

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