Measurement of the eta -&gt; pi(+)pi(-)e(+)e(-) decay branching ratio

Bargholtz, C.; Tikhomirov, V.; Bogoslawsky, D.; Kullander, S.; Clement, H.; Lindberg, K.; Petukhov, Y.; Morosov, B.; Gustafsson, L.; Ekström, C.; Ivanov, G.; Skorodko, T.; Johansson, T.; Jiganov, E.; Pettersson, H.; Wagner, G. J.; Höistad, B.; Stepaniak, J.; Oelert, W.; Zlomanczuk, J.; Zabierowski, J.; Koch, I.; Shafigullin, R.; Thörngren-Engblom, P.; Calen, H.; Bashkanov, M.; Geren, L.; Laukhin, I. V.; Tchernyshev, V.; Sopov, V.; Keleta, S.; Shwartz, B.; Kuznetsov, A.; Wolke, M.; Zartova, I.; Yamamoto, A.; Scobel, W.; Tegner, P. E.; Fransson, K.; CELSIUS-WASA, Coll.; Ruber, R.J.M.Y.; Jacewicz, M.; Povtorejko, A.; Pauly, C.; Cappellaro, F.; Marciniewski, P.; Demirörs, L.; Meier, R.; Schönning, K.; Turowiecki, A.; Kupsc, A.

doi:10.1016/j.physletb.2006.12.008

Journal Article

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

Bargholtz, C. ; Bashkanov, M. ; Bogoslawsky, D. ; Calen, H. ; Cappellaro, F. ; Clement, H. ; Demirörs, L. ; Ekström, C. ; Fransson, K. ; Geren, L. ; Gustafsson, L. ; Höistad, B. ; Ivanov, G. ; Jacewicz, M. ; Jiganov, E. ; Johansson, T. ; Keleta, S. ; Koch, I. ; Kullander, S. ; Kupsc, A. ; Kuznetsov, A. ; Laukhin, I. V. ; Lindberg, K. ; Marciniewski, P. ; Meier, R. ; Morosov, B. ; Oelert, W.FZJ* ; Pauly, C. ; Pettersson, H. ; Petukhov, Y. ; Povtorejko, A. ; Ruber, R. J. M. Y. ; Schönning, K. ; Scobel, W. ; Shafigullin, R. ; Shwartz, B. ; Skorodko, T. ; Sopov, V. ; Stepaniak, J. ; Tchernyshev, V. ; Tegner, P. E. ; Thörngren-Engblom, P. ; Tikhomirov, V. ; Turowiecki, A. ; Wagner, G. J. ; Wolke, M. ; Yamamoto, A. ; Zabierowski, J. ; Zartova, I. ; Zlomanczuk, J. ; CELSIUS-WASA, C.

2007
North-Holland Publ. Amsterdam

Physics letters / B 644, (2007) [10.1016/j.physletb.2006.12.008]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10558 doi:10.1016/j.physletb.2006.12.008

Abstract: The reaction pd -> He-3 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) x 10(-4). (c) 2006 Elsevier B.V. All rights reserved.

Keyword(s): p deuteron: exclusive reaction ; eta: hadroproduction ; eta: semileptonic decay ; pi: pair production ; electron: pair production ; mass spectrum: (pi+ pi- positron electron) ; eta: branching ratio ; magnetic detector: experimental results ; Uppsala CELSIUS Stor ; p deuteron --> helium-3 eta ; eta --> pi+ pi- positron electron ; 0.893 GeV-kin ; eta meson decays (auto) ; dalitz decays (auto)