Measurement of the η -g π+π-e+e- branching ratio
/ Authors
C. Bargholtz, M. Bashkanov, D. Bogoslawsky, H. Calén, F. Cappellaro, H. Clement, L. Demiroers, C. Ekström, K. Fransson, L. Gerén
and 40 more authors
L. Gustafsson, B. Höistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, S. Keleta, I. Koch, S. Kullander, A. Kupsc, A. A. Kuznetsov, I. V. Laukhin, K. Lindberg, P. Marciniewski, R. Meier, B. Morosov, W. Oelert, C. Pauly, Hanna Pettersson, Y. Petukhov, A. Povtorejko, R. Ruber, K. Schönning, W. Scobel, R. Shafigullin, B. Shwartz, T. Skorodko, V. Sopov, J. Stepaniak, V. Tchernyshev, P. Tegner, P. Thörngren-Engblom, V. Tikhomirov, A. Turowiecki, G. Wagner, M. Wolke, A. Yamamoto, J. Zabierowski, I. Zartova, J. Zlomanczuk
/ Abstract
The reaction at threshold was used to provide a clean source of η mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay η→π+π−e+e− is measured to be (4.3±1.3 ...
Journal: Physics Letters B