Measurement of the eta->pi+pi-e+e- decay branching ratio

CELSIUS-WASA Collaboration: Chr. Bargholtz , M. Bashkanov , D. Bogoslawsky , H. Cal\'en , F. Capellaro , H. Clement , L. Demir\"ors , C. Ekstr\"om

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K. Fransson L. Ger\'en L. Gustafsson B. H\"oistad 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. Sch\"onning W. Scobel R. Shafigullin B. Shwartz T. Skorodko V. Sopov J. Stepaniak V. Tchernyshev P.-E. Tegn\'er P. Th\"orngren Engblom V. Tikhomirov A. Turowiecki G.J. Wagner M. Wolke A. Yamamoto J. Zabierowski I. Zartova J. Z{\l}oma\'nczuk

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classification ✦ hep-ex

keywords decaybranchingeta-pi-eratiocelsiuscleandetector

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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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Measurement of the eta->pi+pi-e+e- decay branching ratio

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