Determination of the η-transition form factor in the γp → pη → pγe+e− reaction

H. Berghäuser, V. Metag, A. Starostin, P. Aguar-Bartolomé, L. K. Akasoy, J. R. M. Annand, Hans-Jürgen Arends, K. Bantawa, R. Beck, V. Bekrenev, A. Braghieri, D. Branford, W. J. Briscoe, J. Brudvik, S. Cherepnya, B. T. Demissie, Evangeline Downie, P. Drexler, M. Dieterle, L. V. Fil'kov, A. Fix, D. I. Glazier, E. Heid, D. Hornidge, O. Jahn … & F. Zehr
The Dalitz decay eta -> gamma e(+)e(-) has been measured using the combined Crystal Ball and TAPS photon detector setup at the electron accelerator MAMI-C. Compared to the most recent transition form-factor measurement in the e(+)e(-) channel, statistics have been improved by one order of magnitude. The e(+)e(-)invariant mass distribution shows a deviation from the QED prediction for a point-like particle, which can be described by a form-factor. Using the usual monopole transition form-factor parameterization,...
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