Measurement of the ω→π0e+e− and η→e+e−γ Dalitz decays with the A2 setup at the Mainz Microtron
- Adlarson, P.
- Afzal, F.
- Aguar-Bartolomé, P.
- Ahmed, Z.
- Annand, J.R.M.
- Arends, H.J.
- Bantawa, K.
- Beck, R.
- Berghäuser, H.
- Biroth, M.
- Borisov, N.S.
- Braghieri, A.
- Briscoe, W.J.
- Cherepnya, S.
- Cividini, F.
- Collicott, C.
- Costanza, S.
- Danilkin, I.V.
- Denig, A.
- Dieterle, M.
- Downie, E.J.
- Drexler, P.
- Ferretti Bondy, M.I.
- Fil'kov, L.V.
- Gardner, S.
- Garni, S.
- Glazier, D.I.
- Glowa, D.
- Gradl, W.
- Gurevich, G.M.
- Hamilton, D.J.
- Hornidge, D.
- Huber, G.M.
- Jude, T.C.
- Käser, A.
- Kashevarov, V.L.
- Kay, S.
- Keshelashvili, I.
- Kondratiev, R.
- Korolija, M.
- Krusche, B.
- Lazarev, A.
- Linturi, J.
- Lisin, V.
- Livingston, K.
- MacGregor, I.J.D.
- Macrae, R.
- Manley, D.M.
- Martel, P.P.
- McGeorge, J.C.
- McNicoll, E.F.
- Metag, V.
- Middleton, D.G.
- Miskimen, R.
- Mornacchi, E.
- Mullen, C.
- Mushkarenkov, A.
- Neganov, A.
- Neiser, A.
- Nikolaev, A.
- Oberle, M.
- Ostrick, M.
- Ott, P.
- Otte, P.B.
- Paudyal, D.
- Pedroni, P.
- Polonski, A.
- Prakhov, S.
- Rajabi, A.
- Robinson, J.
- Ron, G.
- Rosner, G.
- Rostomyan, T.
- Sfienti, C.
- Sikora, M.H.
- Sokhoyan, V.
- Spieker, K.
- Steffen, O.
- Strakovsky, I.I.
- Strandberg, B.
- Strub, Th.
- Supek, I.
- Thiel, A.
- Thiel, M.
- Thomas, A.
- Unverzagt, M.
- Usov, Yu. A.
- Wagner, S.
- Walford, N.
- Watts, D.P.
- Werthmueller, D.
- Wettig, J.
- Witthauer, L.
- Wolfes, M.
- Zana, L.A.
DOIAbstract
The Dalitz decays η → e + e − γ and ω → π 0 e + e − have been measured in the γ p → η p and γ p → ω p reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron. The value obtained for the slope parameter of the electromagnetic transition form factor of η , Λ − 2 η = ( 1.97 ± 0 . 11 tot ) GeV − 2 , is in good agreement with previous measurements of the η → e + e − γ and η → μ + μ − γ decays. The uncertainty obtained in the value of Λ − 2 η is lower than in previous results based on the η → e + e − γ decay. The value obtained for the ω slope parameter, Λ − 2 ω π 0 = ( 1.99 ± 0 . 21 tot ) GeV − 2 , is...
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