/ Experiment-HEP arXiv:0711.3531


Measurement of lepton decays of the eta meson


Berlowski, M. (Lodz, IPJ) ; Bargholtz, Chr. (Stockholm U.) ; Bashkanov, M. (Tubingen U.) ; Bogoslawsky, D. (Dubna, JINR) ; Calen, H. (Uppsala U.) ; Cappellaro, F. (Uppsala U.) ; Clement, H. (Tubingen U.) ; Demirors, L. (Ruhr U., Bochum) ; Ekstrom, C. (Uppsala U.) ; Fransson, K. (Uppsala U.) ; Geren, L. (Stockholm U.) ; Gustafsson, L. (Uppsala U.) ; Hoistad, B. (Uppsala U.) ; Ivanov, G. (Dubna, JINR) ; Jacewicz, M. (Uppsala U.) ; Jiganov, E. (Dubna, JINR) ; Johansson, T. (Uppsala U.) ; Keleta, S. (Uppsala U.) ; Koch, I. (Uppsala U.) ; Kullander, S. (Uppsala U.) ; Kupsc, A. (Uppsala U.) ; Kuznetsov, A. (Dubna, JINR) ; Laukhin, I.V. (Moscow Phys. Eng. Inst.) ; Lindberg, K. (Stockholm U.) ; Marciniewski, P. (Uppsala U.) ; Meier, R. (Tubingen U.) ; Morosov, B. (Dubna, JINR) ; Oelert, W. (Julich, Forschungszentrum) ; Pauly, C. (Ruhr U., Bochum) ; Pettersson, H. (Uppsala U.) ; Petukhov, Y. (Dubna, JINR) ; Povtorejko, A. (Dubna, JINR) ; Ruber, R.J.M.Y. (Uppsala U.) ; Schonning, K. (Uppsala U.) ; Scobel, W. (Ruhr U., Bochum) ; Shafigullin, R. (Moscow Phys. Eng. Inst.) ; Shwartz, B. (Novosibirsk, IYF) ; Skorodko, T. (Tubingen U.) ; Sopov, V. (Moscow, ITEP) ; Stepaniak, J. (Lodz, IPJ) ; Tegner, P.-E. (Stockholm U.) ; Thorngren Engblom, P. (Uppsala U.) ; Tikhomirov, V. (Dubna, JINR) ; Turowiecki, A. (Warsaw U.) ; Wagner, G.J. (Tubingen U.) ; Wolke, M. (Julich, Forschungszentrum) ; Yamamoto, A. (KEK, Tsukuba) ; Zabierowski, J. (Lodz, IPJ) ; Zartova, I. (Stockholm U.) ; Zlomanczuk, J. (Uppsala U.)

Pages: 8

Abstract: A search for rare lepton decays of the eta meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay eta->e+e-e+e- events are reported with a background of 1.3+/-0.2 events. This allows to set an upper limit to the branching ratio of 9.7E-5 (90% CL). The branching ratio for the decay eta->e+e-gamma is determined to (7.8+/-0.5 stat+/-0.7 syst)E-3. An upper limit (90% CL) for the branching ratio for the eta->e+e- decay is 2.7E-5 and a limit for the sum of the eta->mu+mu-mu+mu- and eta->pi+pi-mu+mu- decays is 3.6E-4.

Keyword(s): eta meson decays ; Dalitz decays

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 Record created 2010-10-29, last modified 2014-01-30



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