Measurement of the eta->pi+pi-e+e- decay branching ratio
WASA Collaboration, Chr. Bargholtz, M. Bashkanov, D. Bogoslawsky, H. Calén, F. Capellaro, H. Clement, L. Demirörs, C. Ekström, K. Fransson, L. Gerén, L. Gustafsson, B. Höistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, S. Keleta, I. Koch, S. Kullander, A. Kupsc, A. Kuznetsov, I. V. Laukhin, K. Lindberg, P. Marciniewski, R. Meier, B. Morosov, W. Oelert, C. Pauly, H. Pettersson, Y. Petukhov, A. Povtorejko, R. J. M. Y. Ruber, K. Schönning, W. Scobel, R. Shafigullin, B. Shwartz, T. Skorodko, V. Sopov, J. Stepaniak, V. Tchernyshev, P. -E. Tegnér, P. Thörngren Engblom, V. Tikhomirov, A. Turowiecki, G. J. Wagner, M. Wolke, A. Yamamoto, J. Zabierowski, I. Zartova, J. Złomańczuk
Abstract
The reaction pd->3He eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta->pi+pi-e+e- is measured to be (4.3+/-1.3+/-0.4)x10-4.
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