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26 April 2024

» arxiv » 0802.2064

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Determination of the Parity of the Neutral Pion via the 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.Kotera ; A.Ledovskoy ; P.L.McBride ; E.Monnier ; H.Nguyen ; R.Niclasen ; D.G.Phillips II ; 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 ;
Date:	14 Feb 2008
Abstract:	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).
Source:	arXiv, 0802.2064
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