Determination of the Parity of the Neutral Pion via the Four-Electron Decay

Details Determination of the Parity of the Neutral Pion via the Four-Electron Decay Determination of the Parity of the Neutral Pion via the Four-Electron Decay

2008-02-14

arxiv.org/abs/0802.2064v2

Phys.Rev.Lett.100:182001,2008

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 4 figures. Typographical error in radiative branching ratio (Eq. 6) corrected

Scientific paper

10.1103/PhysRevLett.100.182001

We present a new determination of the parity of the neutral pion via the double Dalitz decay pi^0 -> e+ e- e+ e-. Our sample, which consists of 30511 candidate decays, was collected from K_L -> pi0 pi0 pi0 decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative pi^0 parity, and place a limit on scalar contributions to the pi^0 -> e+ e- e+ e- decay amplitude of less than 3.3% assuming CPT conservation. The pi^0 gamma* gamma* 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(pi^0 -> e+ e- e+ e-) = (3.26 +- 0.18) x 10^(-5).

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