Source: https://edoc.unibas.ch/58462/
Timestamp: 2019-04-25 08:53:38+00:00

Document:
Adlarson, P. and Afzal, F. and Aguar-Bartolome, P. and Ahmed, Z. and Annand, J. R. M. and Arends, H. J. and Bantawa, K. and Beck, R. and Berghaeuser, H. and Biroth, M. and Borisov, N. S. and Braghieri, A. and Briscoe, W. J. and Cherepnya, S. and Cividini, F. and Collicott, C. and Costanza, S. and Danilkin, I. V. and Denig, A. and Dieterle, M. and Downie, E. J. and Drexler, P. and Bondy, M. I. Ferretti and Fil`kov, L. V. and Gardner, S. and Garni, S. and Glazier, D. I. and Glowa, D. and Gradl, W. and Gurevich, G. M. and Hamilton, D. J. and Hornidge, D. and Huber, G. M. and Jude, T. C. and Kaeser, A. and Kashevarov, V. L. and Kay, S. and Keshelashvili, I. and Kondratiev, R. and Korolija, M. and Krusche, B. and Lazarev, A. and Linturi, J. and Lisin, V. and Livingston, K. and MacGregor, I. J. D. and Macrae, R. and Manley, D. M. and Martel, P. P. and McGeorge, J. C. and McNicoll, E. F. and Metag, V. and Middleton, D. G. and Miskimen, R. and Mornacchi, E. and Mullen, C. and Mushkarenkov, A. and Neganov, A. and Neiser, A. and Nikolaev, A. and Oberle, M. and Ostrick, M. and Ott, P. and Otte, P. B. and Paudyal, D. and Pedroni, P. and Polonski, A. and Prakhov, S. and Rajabi, A. and Robinson, J. and Ron, G. and Rosner, G. and Rostomyan, T. and Sfienti, C. and Sikora, M. H. and Sokhoyan, V. and Spieker, K. and Steffen, O. and Strakovsky, I. I. and Strandberg, B. and Strub, Th. and Supek, I. and Thiel, A. and Thiel, M. and Thomas, A. and Unverzagt, M. and Usov, Yu. A. and Wagner, S. and Walford, N. and Watts, D. P. and Werthmueller, D. and Wettig, J. and Witthauer, L. and Wolfes, M. and Zana, L. A.. (2017) Measurement of the ω→π0e+e− and η→e+e−γ Dalitz decays with the A2 setup at the Mainz Microtron. Physical Review C, 95 (3). 035208.
The Dalitz decays η→e+e−γ and ω→π0e+e− have been measured in the γp→ηp and γp→ωp 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−2η=(1.97±0.11tot)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−2η is lower than in previous results based on the η→e+e−γ decay. The value obtained for the ω slope parameter, Λ−2ωπ0=(1.99±0.21tot)GeV−2, is somewhat lower than previous measurements based on ω→π0μ+μ−, but the results for the ω transition form factor are in better agreement with theoretical calculations, compared to earlier experiments.

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