Measurement of the ω→π0e+e- and η→e+e-γ Dalitz decays with the A2 setup at the Mainz Microtron

P. Adlarson, F. Afzal, P. Aguar-Bartolomé, Z. Ahmed, J. R.M. Annand, H. J. Arends, K. Bantawa, R. Beck, H. Berghäuser, M. Biroth, N. S. Borisov, A. Braghieri, W. J. Briscoe, S. Cherepnya, F. Cividini, C. Collicott, S. Costanza, I. V. Danilkin, A. Denig, M. DieterleE. J. Downie, P. Drexler, M. I. Ferretti Bondy, L. V. Fil'Kov, S. Gardner, S. Garni, D. I. Glazier, D. Glowa, W. Gradl, G. M. Gurevich, D. J. Hamilton, D. Hornidge, G. M. Huber, T. C. Jude, A. Käser, V. L. Kashevarov, S. Kay, I. Keshelashvili, R. Kondratiev, M. Korolija, B. Krusche, A. Lazarev, J. Linturi, V. Lisin, K. Livingston, I. J.D. Macgregor, R. Macrae, D. M. Manley, D. P. Watts, A2 Collaboration at MAMI, Dominik Werthmüller

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Abstract

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, Λη-2=(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 Λη-2 is lower than in previous results based on the η→e+e-γ decay. The value obtained for the ω slope parameter, Λωπ0-2=(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.

Original languageEnglish
Article number035208
JournalPhysical Review C
Volume95
Issue number3
DOIs
Publication statusPublished - 22 Mar 2017

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©2017 American Physical Society

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